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
sineoko [7]
3 years ago
15

The photeselestric effect is observed when light of a sufficiently high frequency is focused onto a polished metal surface, emit

ting photo electrons with a kinetic energy that is given by the difference betweent he photon enerzy and the work function of the metal Historically, this effect was very confusing. For most wave phenon tand ight was wel known to behave as a wave phenomenon·ore nerease the increasing the amplitude of the wave. in the case of light, this means increase- there are simple more electrons emitted increasing the ententisty. However, with increased intensity, the kinetic energy of the photoelections emited does not Albert Einstein (1879-1955) offered a solution to this perplecing problem in hi 190s paper!,-Ober einen die Erzeugung und Verwandlung des Lichtes betrefflenden heuristischen Gesichtspunkr. Einstein proposed the following relationship: kinetic- hw-E work function energy of an emitted photoelectron, hw is the energy of a photon of frequency v and Ework function is the wrok function for the metal used in the ion is the energy required to remove an electron from the surface of the metal experiment. The work functi References Einstein, Albert (1905). The work function of cesium is 2.1 ev. What is this energy in? Hint: 1 ev-1,602 x 10-19) Annalen der Physik 17(6 132-148 (1905) 34x 1019) 21x 1019 64x 1019 43x 1019 19, 0 19, 0
Physics
1 answer:
Helga [31]3 years ago
8 0

Answer:

3.4\cdot 10^{-19} J

Explanation:

In order to convert the work function of cesium from electronvolts to Joules, we must use the following conversion factor:

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

In our problem, the work function of cesium is

E=2.1 eV

so, we can convert it into Joules by using the following proportion:

1 eV : 1.6\cdot 10^{-19} J = 2.1 eV : x\\x=\frac{(1.6\cdot 10^{-19} J)(2.1 eV)}{1 eV}=3.4\cdot 10^{-19} J

You might be interested in
Projectile <br> SHOW WORK<br> WILL MARK BRANLIEST <br> (Draw Picture and Label)
m_a_m_a [10]

a) The horizontal distance covered by the projectile is 600 m

b) The projectile reaches its maximum height after 3.00 s

c) The altitude of the highest point is 44.1 m

Explanation:

a)

The motion of the projectile consists of two independent motions:  

- A uniform motion (constant velocity) along the horizontal direction  

- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction  

In this part A, we just need to analyze the horizontal motion. We know that:

  • The projectile travels horizontally with a constant velocity ov v_x = 100 m/s
  • The total time of flight of the projectile is t=6.00 s

Therefore, the horizontal distance covered by the projectile is given by

x=v_x t

And substituting, we find

x=(100)(6.0) = 600 m

b)

For this part, we need to analyze the vertical motion of the projectile.

First, we want to find the initial vertical velocity. We can do it by using the equation for the vertical displacement:

s=u_y t + \frac{1}{2}at^2

where:

u_y is the initial vertical velocity

a=g=-9.8 m/s^2 is the acceleration of gravity (negative because it is downward)

t is the time

s is the vertical displacement

We know that the total time of flight is t = 6.00 s: this means that when t=6, the projectile returns to its initial vertical position, so s = 0. Substituting and solving for u_y, we get

u_y = - \frac{1}{2}at=-\frac{1}{2}(-9.8)(6)=29.4 m/s

The vertical velocity then as a function of t is given by

v_y = u_y + at

And at the maximum height, it becomes zero: v_y = 0. Substituting and solving for t, we find the time at which the projectile reaches the maximum height:

t=-\frac{u_y}{a}=-\frac{29.4}{-9.8}=3.00 s

c)

To find the altitude of the highest point in the path, we use again the equation:

s=u_y t + \frac{1}{2}at^2

where

u_y = 29.4 m/s is the initial vertical velocity

t = 3.00 s is the time at which the projectile reaches the highest point

a=g=-9.8 m/s^2 is the acceleration of gravity

Substituting the values, we find

s=(29.4)(3.00)+\frac{1}{2}(-9.8)(3.00)^2=44.1 m

So, the highest point is at 44.1 m above the ground.

Learn more about projectiles:

brainly.com/question/8751410

#LearnwithBrainly

8 0
3 years ago
A flywheel with radius of 0.300 m starts from rest and accelerates with a constant angular acceleration of 0.400 rad/s2.For a po
oksian1 [2.3K]

Answer:

0.12\ m/s^2

Explanation:

Given that,

The radius of a flywheel, r = 0.3 m

Angular acceleration of a flywheel, \alpha =0.4\ rad/s^2

We need to find the magnitude of the tangential acceleration after 2.00 s of acceleration.

The relation between the tangential and angular acceleration is given by :

a_t=r\alpha \\\\a_t=0.3\times 0.4\\\\a_t=0.12\ m/s^2

So, the required magnitude of tangential acceleration is 0.12\ m/s^2.

6 0
3 years ago
If you know the answer please answer the following question down in the picture below.
Harlamova29_29 [7]
I think it’s the second one: magnetic domains must come in pairs—one north and one south
3 0
3 years ago
Which of the following is a characteristic of digital data?
Westkost [7]

Answer:

duplication being slightly more expensive.

Explanation:

3 0
3 years ago
Periodic table of elements metals and nonmetals questions
bixtya [17]

Answer:

1 o b

2 c\

3 a

Explanation:

5 0
2 years ago
Read 2 more answers
Other questions:
  • What is the linkin park song that has rattling metal noise in it?
    15·1 answer
  • Explain how power and work are related
    6·2 answers
  • PLEASE HURRYYYYYY:
    10·1 answer
  • Explain why static charges do not build up on a conductor
    15·2 answers
  • Why are two balls connected by a spring a good model for two atoms connected by a chemical bond?
    9·1 answer
  • Suppose a plot of 1/λ vs f has a slope of 0.728, what is the wave velocity? Give only the numerical answer with 4 decimal place
    12·2 answers
  • Three forces are applied to an object, as shown in the diagram below. F1 = 30 N, F2 = 34 N, F3 = 20 N, d1 = 25 mm, d2 = 20 mm, d
    8·1 answer
  • The greatest force in momentum will be produced by
    6·1 answer
  • The student hung the plastic strip over a wooden rod
    8·1 answer
  • PLEASE ANSWER NEED HELP!!!!!!!! PLEASE THE CORRECT ANSWER!!!!!!
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!