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
Marysya12 [62]
4 years ago
13

The maximum wavelength that an electromagnetic wave can have and still eject electrons from a metal surface is 459 nm. What is t

he work function W0 of this metal? Express your answer in electron volts.
Physics
1 answer:
spin [16.1K]4 years ago
4 0

Answer:

2.7067 eV

Explanation:

h = Planck's constant = 6.626\times 10^{-34}\ m^2kg/s

c = Speed of light = 3\times 10^8\ m/s

\lambda_0 = Threshold wavelength = 459 nm

Work function is given by

W_0=\frac{hc}{\lambda_0}\\\Rightarrow W_0=\frac{6.626\times 10^{-34}\times 3\times 10^8}{459\times 10^{-9}}\\\Rightarrow W_0=4.33072\times 10^{-19}\ J

Converting to eV

1\ J=\frac{1}{1.6\times 10^{-19}}\ eV

4.33072\times 10^{-19}\ J=4.33072\times 10^{-19}\times \frac{1}{1.6\times 10^{-19}}\ eV=2.7067\ eV

The work function W0 of this metal is 2.7067 eV

You might be interested in
According to Newton's first law of motion, which force is expected to cause a body to accelerate? A. unbalanced force B. balance
Irina-Kira [14]

A. an unbalanced force


5 0
4 years ago
Read 2 more answers
A simple arrangement by means of which e.m.f,s. are compared is known
strojnjashka [21]

Answer:

A simple arrangement by means of which e.m.f,s. are compared is known as?

(a)Voltmeter

(b)Potentiometer

(c)Ammeter

(d)None of the above

Explanation:

5 0
3 years ago
Were the continents once joined together as a supercontinent? Give 3 pieces of evidence to support Alfred Wegeners Theory of Con
sattari [20]
Yes! Fossils, The outlines of the continents and geological features .
5 0
3 years ago
Read 2 more answers
Easy quiz easy points 7
Darya [45]
The answer is 2: hush
5 0
3 years ago
Read 2 more answers
Suppose the roller-coaster car in fig.6–41 passes point 1 with a speed of if the average force of friction is equal to 0.23 of i
madreJ [45]

The values in figure 1 shows h1 = 39 m, h2 = 13 m, h3 = 25 with a speed of 1.5m/s

 

The Initial speed u = 1.5m/s.

Vertical distance covered between point 1 and point 2 is (39-13) =26m

The expanse 45 m is equal to a height of (45/6) =7.5 (As frictional force is mg/6)

With the kinematics equation v^2 =u^2 + 2as

V^2 = 1.5^2 + 2*9.8 (26 + 7.5)

V = 25.7 m/s

8 0
4 years ago
Other questions:
  • Hydroelectric dams use ------- to produce electricity. gravitational potential energy of falling water
    12·1 answer
  • How much would you have to shrink a baseball to a black hole?
    7·1 answer
  • Is it possible to compress an ideal gas isothermally in an adiabatic piston–cylinder device? explain?
    6·1 answer
  • Consider a series rlc circuit where r = 45.0 ω, c = 15.5 μf, and l = 0.0940 h, driven at a frequency of 50.0 hz. determine the p
    9·1 answer
  • What is the average velocity of the particle from rest to 15 seconds? A. 1.1 meters/second B. 1.2 meters/second C. 1.3 meters/se
    14·1 answer
  • Ask Your Teacher A circular wire loop whose radius is 10.0 cm carries a current of 3.60 A. It is placed so that the normal to it
    7·1 answer
  • 1. What is the magnitude of the force on a charge of +40 μC that is 0.6 m from a charge of - 80 μC?
    6·1 answer
  • To get up on the roof, a person (mass 85 kg) places a 6.82 m aluminum ladder (mass 12.6 kg) against the house on a concrete pad
    6·1 answer
  • Helppppppp pleaseeee
    9·1 answer
  • 4. An archer pulls a bowstring back 0.440 m, and the spring constant of the bow is 545 N/m.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!