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
Assoli18 [71]
3 years ago
6

Light of 1.5 ✕ 1015 hz illuminates a piece of tin, which has a work function of 4.97 ev. (a) what is the maximum kinetic energy

of the photoelectrons?
Physics
1 answer:
stiks02 [169]3 years ago
8 0
In the photoelectric effect, the energy of the incoming photon (E=hf) is used in part to extract the photoelectron from the metal (work function) and the rest is converted into kinetic energy of the photoelectron:
hf = \phi + K
where
h is the Planck constant
f is the frequency of the incident light
\phi is the work function of the material
K is the kinetic energy of the photoelectron.

The photoelectron generally loses part of its kinetic energy inside the material; however, we are interested in its maximum kinetic energy, that is the one the electron has when it doesn't lose energy, so we can rewrite the previous equation as
K_{max} = hf - \phi

The work function is (in Joule)
\phi = (4.97 eV)(1.6 \cdot 10^{-19} J/eV)=7.95 \cdot 10^{-19} J

and using the data of the problem, we find the maximum kinetic energy of the photoelectrons
K_{max} = (6.6 \cdot 10^{-34} Js)(1.5 \cdot 10^{15} Hz)-7.95 \cdot 10^{-19}J= 1.95 \cdot 10^{-19} J

You might be interested in
The irreversible thermite reaction (Fe2O3 + 2 Al --> 2 Fe + Al2O3) is highly exothermic, changing the temperature by over 100
likoan [24]

Answer:

the water will boil and change into a gas

Explanation:

This is because it is exothermic and releases the energy into the surroundings and the fact that water boils at 100 degrees Celsius

6 0
3 years ago
a swimmer can swim in still water at a speed of 9.50 m/s. he intends to swim directly across the river that has a downstream cur
Doss [256]
Refer to the diagram shown below.

Still-water speed  = 9.5 m/s
River speed = 3.75 m/s down stream.

The velocity of the swimmer relative to the bank is the vector sum of his still-water speed and the speed of the river.

The velocity relative to the bank is
V = √(9.5² + 3.75²) = 10.21 m/s

The downstream angle is
θ = tan⁻¹ 3.75/9.5 = 21.5°

Answer:  10.2 m/s at 21.5° downstream.

7 0
3 years ago
Read 2 more answers
A visual display of data or information is a
Artist 52 [7]

A visual display of data or information is called a graph. There are many types of graphs. These can include pie graphs, bar graphs, and many more. Graphs are useful, because they show you visually data which is helpful to many. Hope this helped

4 0
3 years ago
How might the velocity (speed) of wind or water affect the deposition of sediments?
Maksim231197 [3]
Well depending on the speed of both of those things is were the rock will be placed and it also determines how fast can an environment change
<span />
6 0
3 years ago
100 °C is a greater temperature than which of the following?
ohaa [14]
When somebody hands you a Celsius°, it's easy to find the equivalent Fahrenheit°.

Fahrenheit° = (1.8 · Celsius°) + 32° .

So 100°C works out to 212°F.  

It's also easy to find the equivalent Kelvin.  Just add 273.15 to the Celsius.

So now you can see that  100°C  is equal to  A  and  D,
and it's less than  B .

The only one it's greater than is  C .
6 0
3 years ago
Other questions:
  • What questions should be considered when evaluating the reliability of a website?
    5·2 answers
  • A satellite in geostationary orbit is used to transmit data via electromagnetic radiation. The satellite is at a height of 35,00
    15·1 answer
  • When a balloon is rubbed with human hair, the balloon acquires an excess static charge. This implies that some materials A) cond
    13·1 answer
  • Two things you can do to increase the acceleration of an object
    13·1 answer
  • Match each action to its result. The strength of the electromagnet increases. The electromagnet turns off. The poles of the elec
    8·1 answer
  • The atoms of a molecule come from two or more?
    7·2 answers
  • A bus travel with an average velocity of 60km/h. How long does it take to cover a distance of 500km​
    12·1 answer
  • What is the definition of mechanical waves
    8·2 answers
  • Tyler is in downtown San Antonio entertaining the tourists with amazing feats of physics. He carries a nickel
    11·1 answer
  • Which fact is true during a fission chain reaction?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!