1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Veseljchak [2.6K]
4 years ago
15

Enter your answer in the provided box. The mathematical equation for studying the photoelectric effect is hν = W + 1 2 meu2 wher

e ν is the frequency of light shining on the metal; W is the energy needed to remove an electron from the metal; and me and u are the mass and speed of the ejected electron, respectively. In an experiment, a student found that a maximum wavelength of 351 nm is needed to just dislodge electrons from a metal surface. Calculate the velocity (in m/s) of an ejected electron when the student employed light with a wavelength of 303 nm.
Physics
1 answer:
siniylev [52]4 years ago
6 0

Answer:

v = 4.44 \times 10^5 m/s

Explanation:

By Einstein's Equation of photoelectric effect we know that

h\nu = W + \frac{1}{2}mv^2

here we know that

h\nu = energy of the photons incident on the metal

W = minimum energy required to remove photons from metal

\frac{1}{2}mv^2 = kinetic energy of the electrons ejected out of the plate

now we know that it requires 351 nm wavelength of photons to just eject out the electrons

so we can say

W = \frac{hc}{351 nm}

here we know that

hc = 1242 eV-nm

now we have

W = \frac{1242}{351} = 3.54 eV

now by energy equation above when photon of 303 nm incident on the surface

\frac{1242 eV-nm}{303 nm} = 3.54 eV + \frac{1}{2}(9.1 \times 10^{-31})v^2

4.1 eV = 3.54 eV + (4.55 \times 10^{-31}) v^2

(4.1 - 3.54)\times 1.6 \times 10^{-19}) = (4.55 \times 10^{-31}) v^2

8.96 \times 10^{-20} = (4.55 \times 10^{-31}) v^2

v = 4.44 \times 10^5 m/s

You might be interested in
A 1056-hertz tuning fork is struck at the same time as a note on the piano and you hear 2 beats/second. You tighten the piano st
elena-14-01-66 [18.8K]

Answer:

The frequency of the piano string is <em>1059 Hz</em>.

Explanation:

The frequency beat (fb), 2 beats/second, is the absolute difference between the frequency of the tuning fork (1056 Hz) and the frequency of the piano string.

As the piano string gets tightened, the frequency beat becomes 3 beats/second.

Therefore,

fb = fb = fpiano - ftuning fork\\ 3 Hz=fpiano-1056Hz\\ fpiano=1056Hz+3Hz\\ fpiano=1059Hz

6 0
3 years ago
If the mass of a material is 82 grams and the volume of the material is 14 cm3, what would the density of the material be
Sindrei [870]
By definition,
density = mass/volume

The mass is 82 g
The volume is 14 cm³

Therefore
density = (82 g)/(14 cm³) = 5.857 g/cm³
In SI units, density = 5857 kg/m³

Answer: 5.857 g/cm³
6 0
3 years ago
How do I solve using the formula:<br><br> Vf^2=vo^2+2gh<br><br> ^2 means square
PtichkaEL [24]

your second line ... minus 2gh ...

5 0
3 years ago
A positively-charged piece of plastic exerts an attractive force on an electrically neutral piece of paper. This is because: 1.
Furkat [3]

Answer:

1 ) Electrons are less massive than than atomic nuclei.

Explanation:

A positively charged body tends to attract negatively charged particle and repel positively charged particle. Neutral body consists of atoms which contain both positively charged particles ( electrons ) and negatively charged particles ( protons ). Electrons are small and light in weight . Both electrons and protons experience equal and opposite force by an external charged body but shift in electron is more because of their being comparatively lighter. So the body gets polarized due to uneven distribution of charge. This results into body getting attracted through the process of induction.

3 0
4 years ago
Aansi wants energy on a sound wave to be carried more quickly through a metal medium. Which could she do?.
Iteru [2.4K]

Aansi has to increase the temperature for sound wave to be carried more quickly through a metal medium.

<h3>What is temperature?</h3>

The temperature is the degree of hotness or coldness of the object.

When the temperature of any medium is increased, it becomes less dense. The wave travels faster in the rarer medium than the denser medium. So, in less denser medium, wave travel more faster.

Thus, Aansi has to increase the temperature for sound wave to be carried more quickly through a metal medium.

Learn more about temperature.

brainly.com/question/11464844

#SPJ1

4 0
3 years ago
Other questions:
  • A net force of 40 N south acts on an object with a mass of 20 kg. What is the object's acceleration? (Hint: Use the formula a =
    10·1 answer
  • A small 21 kilogram canoe is floating downriver at a speed of 1 m/s. What is the canoe's kinetic energy?
    12·1 answer
  • One radian per second is equal to?
    10·1 answer
  • The most common purpose for fracking in the u.s is to get
    12·1 answer
  • A cat starts to walk straight across a 100-meter-long field to her favorite tree. After 20 m, a dog sees the cat and chases it a
    15·1 answer
  • How does artificial transmutation differ from nuclear decay
    5·1 answer
  • To move a suitcase up to the check-in stand at the airport a student pushes with a horizontal force through a distance of 0.95 m
    15·1 answer
  • Which type or types of motion is particle motion in surface waves?
    10·1 answer
  • Fill in the appropriate values for each blank as it refers to ATOM 1. The number of protons present in ATOM 1 is _________.​
    5·1 answer
  • You drive a car 660 m to the east, then 400 m to the north. What is the magnitude of your displacement? Using a sketch, estimate
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!