Answer:
the work function of the metal is 4.167 x 10⁻¹⁹ J .
Explanation:
Given;
wavelength of the incident light, λ = 450 nm = 450 x 10⁻⁹ m
kinetic energy, K.E = 2.5 x 10⁻²⁰ J
The energy of the incident light is calculated as;
[tex]E = hf = \frac{h c}{\lambda} \\\\where;\\\\c \ is \ speed \ of \ light = 3 \times 10^8 \ m/s\\\\ h \ is \ Planck's constant = 6.626 \times 10^{-34} Js \\\\E = \frac{(6.626 \times 10^{-34})(3\times 10^8)}{450 \times 10^{-9}} \\\\E = 4.417 \times 10^{-19} \ J[/tex]
Apply Einstein photoelectric equation to determine the work function of the metal;
E = W + K.E
where;
W is the work function of the metal
W = E - K.E
W = 4.417 x 10⁻¹⁹ J - 2.5 x 10⁻²⁰ J
W = 44.17 x 10⁻²⁰ J - 2.5 x 10⁻²⁰ J
W = 41.67 x 10⁻²⁰ J
W = 4.167 x 10⁻¹⁹ J
Therefore, the work function of the metal is 4.167 x 10⁻¹⁹ J .
The work function of the photon is 4.167*10^19J
The energy of this photon can be calculated as
E = hc/λ
Data given;
λ = 450nm = 450*10^-9mh = 6.626*10^-34JSK.E = 2.5*10^-20Jc = 3.0*10^8m/sEnergy of the Photonsubstituting the values into the equation;
[tex]E = hc / y\\E = \frac{6.626*10^-^3^4*3.0*10^8}{450*10^-^9} \\E = 4.42*10^-^1^9J[/tex]
Work FunctionThe work function of the photon can be calculated as;
E = K.E + Ф
4.42*10^-19 = 2.5*10^-20 + Ф
Ф = [tex]4.42*10^-^1^9 - 2.5*10^-^2^0=4.167*10^-^1^9J[/tex]
The work function of the photon is 4.167*10^-19 J
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Explain why refraction takes place.
Please help explain in a simple way
Answer:
lCdfKFBWRblNLWFNJLBe
Explanation:
jk jk Refraction is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light
Please what is the work done by a man who is pulling a box of 45kg of mass by means of rope which makes angle of 45 degrees ?
Answer:
No work is done since no distance is given
Explanation:
Since no distance is given, the force is not doing any work
No work is done by the man since we do not know the distance or displacement.
Work is only said to be done when the force applied on an object moves it through a particular distance.
Work done = Force x distance.
Since no distance is given in this problem, we can as well assume that the force applied is doing no work on the object.
what kind of earthquake related technologies are engineers and scientists working on currently?
Answer:
Technologies such as seismographs, creepmeters, and laser beams are used to detect seismic events.
Explanation:
What could you do to find the density of a fork, knife, and a spoon?
Answer:
Density is equal to mass divided by volume.
Explanation:
Density = mass / volume
or
p=m/v
Answer:
Use the formula D=m/v
Explanation: In order to find the volume for these objects, use a ruler and measure the length, width, and height. Proceed to multiply them all together, L*W*H. To find the mass of an object, I would say to use a triple beam balance. After finding both the mass and volume of you object, use the formula D = m/v and you'll get your answer.
6th grade science!!!!!!!!!!
Answer:
D. All of the above
Explanation:
Global warming may cause all of the given choices.
Global warming is the rise in surface temperature. This is due to the trapping of heat within the earth surface.
It is as a result of huge amount of greenhouse gases within our atmosphere. They typically permit short wave radiations to escape and they do not allow short wave radiation to pass through. This in turn produces heat.
The heat can melt polar ices and glaciers. This in turn will cause sea levels to rise. Also, the ocean temperature will generally increase due to this.A ball of mass 0.3kg, moving at a velocity of 20m/s is suddenly hit by a force of 5N for a time of 0.03 sec. Find its new velocity of motion
Answer:
F * t = m * Δv
F * t = m * (v2 - v1) where v2 is the new velocity and v1 is the current velocity
m * (v2 - v1) = (F * t)
Plugging in the values,
0.3kg * v2 - 0.3kg * 20 m/s = 5 * 0.03 s
0.3 * v2 - 6 = 0.15
0.3 * v2 = 0.15 + 6
v2 = 6.15 / 0.3
v2 = 20.5 m/s
The new velocity of motion is 20.5 m/s.
(b)Suggest with reasons,what must be added to the flask to keep the liquid hot.
____________________________________________________
(a) a thin layer of vacuum is provided between the two walls of flask, to minimise the heat loss by conduction , because for conduction medium (molecules) is required , but now medium is absent .
.(b) the two walls are silvered to minimise the heat loss by radiation , because a shiny surface is a bad absorber and bad emitter of radiation i.e. good reflector of heat , so prevents the heat exchange between content of flask and surrounding .
(c) the lid of flask is provided with a tight cork stopper to minimise the heat loss by convection , so that convection currents cannot go out .
(d) a plastic (or metal) case is provided with a flask , to protect the flask from physical damage
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What type of electrical cord has a ground?
3 pronged cord
2 pronged cord
Explanation:
One prong is known as the hot wire, where the electricity comes in, while the second prong is the neutral wire and electricity leaves. Recall that a circuit must be made for electrons to flow. This means that electrons enters your house through the transmission wires and then the electrons leave along the same lines they entered (just along a different wire).
This set up describes a 2 pronged cord. Adding a third prong allows for a grounding to happen. In the event of an electrical surge, when too many electrons are flowing, disaster is likely to happen without some kind of safety features. The grounding prong allows electrons to seek the ground. You can think of it like a drain in a bathtub when too much water gets in the tub.
Answer:
3 pronged cord
Explanation:
A car moved 80 km to the south.What is its displacement?
car moved 80 km to the South. What is its displacement? 80 km South -------------------------------------
What is the main power and purpose of the legislative branch?
i always need help with physics
Answer:
House and Senate.
Explanation:
declares war, regulates interstate and foreign commerce and controls taxing and spending policies.
Picking up a puppy is easy, but picking up a large horse is difficult. *
1st law
2nd law
3rd law
Answer:
1st
Explanation:
It is because the horse is heavier
Which of these statements is FALSE?*
If you find someone's DNA at a crime scene, they are guilty without a doubt
Even identical Twins have different DNA Fingerprints
DNA is individual evidence
When DNA is found, it will not always lead to usable DNA Fingerprint evidence
If the mass of an object increases, then its kinetic energy will ____________ because __________________________
Answer:
when mass will increase then kinetic energy will also increase because both have positive relationship
Explanation:
when volume increase then molecule come closer then more movement will occurs and kinetic energy increase
Test populations are studied. Population one is found to obey the differential equation dy1/da=o.2y1 and the population two obeys dy2/da = -0.3y2 , where t is the time in years? Which population is growing and which is declining
Answer:
Population 1 indicates growth while Population 2 indicates a declining population
Explanation:
Here, using the given rate of change of the population, we want to determine which of the two is growing and which is declining
From the rate of change of both, we can determine this. Looking at the differential equation for the first one, we can see that it is of positive value. Looking at the differential equation for the second one. we can see it is of negative value
While a positive change rate indicates growth, a negative change rate will indicate otherwise
Hence, we can conclude that the one with a negative rate change will indicate a declining population
The eagles suck, so do the giants and the jets and jaguars are irrelevant
anyone wanna argue
Naw ur pretty accurate, heck collage is the only football worth watching most the time. Hook'um horns!
What is a heating curve of water?
Answer:
eye
Explanation:
Two resistors are used in an experiment. Resistor 1 had a resistance of 4 ohms and resistor 2 has a resistance of 2 ohms. Which resistor will have the bigger current flowing through it if the potential difference is constant
Answer:
2ohms resistor
Explanation:
According to ohms law
V= IR
V is the potential difference
I is the current
R is the resistance
Since they have the same potential difference, this shows that they are connected in parallel
Let assume V = 20V
For the 4ohms resistor
I = V/R
I = 20/4
I = 5A
For the two ohms resistor
I = V/R
I = 20/2
I = 10A
This shows that the 2ohms resistor will have the bigger current because the smaller the load, the bigger the current and vice versa
Answer:
2
Explanation:
Match each term with the appropriate definition.
mass
the amount of matter in an object
balance
the downward pull on an object due to
gravity.
weight
a tool used to measure weight
scale
a tool used to measure mass
Answer:
mass- the amount of matter in an object
balance- tool used to measure mass
scale- a tool used to measure weight
weight- the downward pull on an object due to gravity
When one end of a metal bar is heated, the opposite end will eventually become hot. Which of the following processes transfers the heat through the bar?
Group of answer choices
condensation
radiation
convection
conduction
Someone pls help me with this!
Answer:
F=8.87 N
Explanation:
Coulomb's Law
The electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between the two objects.
Written as a formula:
[tex]\displaystyle F=k\frac{q_1q_2}{d^2}[/tex]
Where:
[tex]k=9\cdot 10^9\ N.m^2/c^2[/tex]
q1, q2 = the objects' charge in coulomb
d= The distance between the objects in meters
Object 1 has a charge of
[tex]q_1=-2.3\cdot 10^{-6}\ c[/tex]
Object 2 has a charge of
[tex]q_2=-4.2\cdot 10^{-6}\ c[/tex]
They are separated by a distance of
d = 0.099 m
Calculate the force:
[tex]\displaystyle F=9\cdot 10^9\frac{2.3\cdot 10^{-6}*4.2\cdot 10^{-6}}{0.099^2}[/tex]
F=8.87 N
What type of wave did you create when you pushed your arm back and forth?
plz help
Answer: It is a transverse wave ^^
Explanation:
PLEASE HELP ASAP!!!!!
Carrie pulls a 41.5 kg bin across the floor of her garage using a rope that is attached to the bin. She pulls with a force of 138 N, at an angle of 28.0° above horizontal. The coefficient of kinetic friction between the floor and the box is 0.290 . What is the acceleration of the box?
Answer: 0.81N
Explanation: Fwx = .165x 9.81 Silicon 30 = 0.81N
What is the same about a particle as gas, liquid, or solid?
A. The speed at which the particles move.
B. The volume that the substance takes up.
C. The chemical composition.
D. The temperature of the substance.
The thing same about a particle as gas, liquid, or solid is its chemical composition.
What are states of matter?
Matter exists in three different states: solid, liquid, and gas. By examining the configuration of their particles, it is possible to understand why they have various qualities. Theoretically, at this temperature, particles move slowly and have the least amount of energy.
Phase refers to the material's actual state. To pay attention to is the word physical. Only physical means can change the state of matter. You can make a physical change if energy is added (by raising the temperature) or subtracted (by freezing things).
The chemical composition of matter same about a particle as gas, liquid or solid.
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•1. Identify the four inner/terrestrial planets.
Answer:
1) Mercury
2) Venus
3) Earth
4) Mars
Explanation:
Answer:
The for inner/terrestrial planets are Mercury, Venus, Earth and Mars
Explanation:
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If an object undergoes a change in velocity, then it also undergoes a change in:
Answer:
acceleration
Explanation:
If the velocity is not constant, then there must be a beginning and ending of its velocity. If that is so and there is also a change in time (which there must be) then there is a change in acceleration.
The formula for that is a = (vf - vi)/t
Answer:
probably acceleration
Explanation:
acceleration is the change in velocity
If Bert the Bat travels East at 200 meters in 10 seconds, what is his velocity?
Answer:
20m/s due east
Explanation:
Given parameters:
Displacement eastward = 200m
Time = 10s
Unknown:
Velocity = ?
Solution:
Velocity is the displacement divided by time;
Velocity = [tex]\frac{displacement}{time}[/tex]
Velocity = [tex]\frac{200}{10}[/tex] = 20m/s due east
From the poem Black woman what does it mean by Savannah stretching to clear horizons, Savannah shuddering beneath the East wind's eager caresses.
Answer:
From the poem Black woman what does it mean by Savannah stretching to clear horizons, Savannah shuddering beneath the East wind's eager caresses.
Explanation:
Have you ever noticed that how much electrical energy is consumed by electrical appliances in your home. Make a chart of all of these appliances with their power in kW and an average use on daily, weekly, and monthly basis. Usually the electrical power is written on most of the appliances or on their packing. Calculate the total consumption of electrical energy in kWh in your home for December, 2020. Find the expected electricity bill for this month, if 1 kWh energy costs Rs 10. Which item consumed most energy during the month
Answer:
A. The expected electricity bill for this month is Rs 18,896.2
B. The item which consumed the most energy during the month is the electric cooker with a total consumption of 1,110Kw/Month
Explanation:
Step 1 - Identify electrical appliances
I only have 8 electrical appliances in my home.
Electric Cooker. Its power rating 3000 Watts (that is 3Kw/h)Refrigerator. Its power rating is 150 Watts (that is 0.15Kw/h)Waterheater. Its power rating is 4000 Watts (that is 4Kw/h)Electric Iron. Its power rating is 1000 Watts (that is 1Kw/h)Led TV. Its power rating is 235 watts (that is 0.235Kw/h)13 Energy-saving Light bulbs at 60 watts which is a total of 780 watts (which is 0.78Kw)Electric Standing Fan. Its power rating is 55 watts (that is 0.055Kw)Washing machine. Its power rating 255 watts (that is 0.255Kw)Step 2 - Assign usage per hour and calculate wattage used /month
The Electric Cooker is used an average of 9 hours/day. This is 270hours/month. Total Kw used per month 3Kw * 270hours = 1,110Kw/MonthThe refrigerator is used 24 hours. That is 0.15Kw *24*30days= 108Kw/MonthThe water heater is used 1 hour every day. That is 4Kw *30days = 120Kw/MonthThe electric Iron is used for 20 Minutes every day.That is 1Kw * 0.34hr *30= 10Kw/MonthThe Led Tv is used for 12hours/day. That is 0.235Kw*12*30=84.6Kw/monthThe bulbs are used for about 18hours/day. That is 0.78kw*18*30= 421.2Kw/monthThe electric standing fan is used for about 18 hours/day. That is 0.055kw*18*30=29.7Kw/monthThe washing machine is used for about 6 hours/week. That is 0.255Kw*4*6=6.12Kw/month
Step 3 - Add up all the Kw used per month and multiply by the cost of 1 Kw
Total Kilowatt Consumed/Month = 1110 +108+120+10+84.6+421.2+29.7+6.12
= 1,889.62Kw/Month
Total cost of energy consumed per month = 1889.62 * Rs 10
= Rs 18,896.2
Cheers!
The Periodic Table Question 4 of 10 If an element forms a 2+ ion, in which group of the periodic table would you expect to find it? D A. 2 B. 17 O C. 1 D. 18 7
Answer:
B is the difference قصدي لا انا اعرف بشير بس ما اعرف اخوه يعني *قصدي لا انا اعرف بشير بس ما اعرف اخوه يعني *قصدي لا انا اعرف بشير بس ما اعرف اخوه يعني *قصدي لا انا اعرف بشير بس ما اعرف اخوه يعني *قصدي لا انا اعرف بشير بس ما اعرف اخوه يعني *
in which diagram 1 or 2 would the person be experiencing summer? explain
Answer:
Diagram 1
Explanation:
In diagram one, the earth is leaning toward the sun, meaning it is summertime.
The person will experience summer in diagram one because the earth is tilted towards the sun.
What is the summer season?From diagram one we can see that earth is tilted towards the sun. During summer, the North Pole of the earth is tilted towards the sun.
As a consequence, the sun’s path is higher in the sky, causing the northern hemisphere to receive more light and heat.
In addition, because the sun is in the sky for more hours, the summer solstice is also the longest day of the year.
These extra hours of sunlight give the sun more time to heat the earth and this is the main reason for summer to be the hottest season.
During summer the sun is perpendicular to the tropic of cancer and heats more areas that lie in the tropic of cancer.
Thus the answer will be diagram 1 because the earth is tilted towards the sun.
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