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
11111nata11111 [884]
3 years ago
5

If the accelerating voltage va were 250 volts, what would be the speed of the electrons emerging from the gun?

Physics
1 answer:
ELEN [110]3 years ago
7 0

Answer:

v=9.34*10^{6}\frac{m}{s}

Explanation:

According to the law of conservation of energy, the amount of energy an electron gains after being accelerated is equal to its kinetic energy, that is, the electrical potential energy is converted into kinetic energy :

U=K\\eV=\frac{mv^2}{2}

Solving for v and replacing the given voltage:

v=\sqrt\frac{2eV}{m}\\v=\sqrt\frac{2(1.6*10^{-19}C)250V}{9.1*10^{-31}kg}\\v=9.34*10^{6}\frac{m}{s}

You might be interested in
Please annswer will the correct letter I WILL GIVE BRAINLIEST MUST ANSWER BOTH :)
erica [24]
C  and A the first one is a bit weird but thats what i got and you cant even see it that good
3 0
3 years ago
In which of the following scenarios is the total momentum of the system conserved?
leonid [27]

Answer:

The total momentum of a system is conserved only when the system is closed.

Explanation:

7 0
2 years ago
A total electric charge of 6.75 nC is distributed uniformly over the surface of a metal sphere with radius 20.0 cm. If the poten
djverab [1.8K]

Answer:

a) 60 V

b) 125 V

c) 125 V

Explanation:

<u>Given</u>

We are given the total electric charge q = 6.75 nC = 6.75x 10^-9 C distributed uniformly over the surface of a metal sphere with a radius of R = 20.0 cm = 0.020 m.  

<u>Required </u>

We are asked to calculate the potential at the distances

(a) r = 10.0 cm

(b) r = 20.0 cm

(c) r = 40.0 cm  

<u>Solution</u>

(a) Here, the distance r > R so, we can get the potential outside the sphere (r > R) where the potential is given by

V = q/4\pi∈_o                       (1)

r is the distance where the potential is measured and the term 1/4\pi∈_o equals  9.0 x 10^9 Nm^2/C^2. Now we can plug our values for q and r into equation (1) to get the potential V where r = 0.10 m  

V= 1*q/4\pi∈_o*r

 =60 V

(b) Here the distance r is the same for the radius R, so we can get the potential inside the sphere (r = R) where the potential is given by  

V = 1*q/4\pi∈_o*R                (2)    

Now we can plug our values for q and R into equation (2) to get the potential V where R = 0.20 m  

V = 1*q/4\pi∈_o*R

    = 125 V

(c) Inside the sphere the electric field is zero therefore, no work is done on a test charge that moves from any point to any other point inside the sphere. Thus the potential is the same at every point inside the sphere and is equal to the potential on the surface. and it will be the same as in part (b)  

V= 125 V

7 0
3 years ago
When you go out into the sun, the UV light can give you a tan. UV light has a frequency of 7.89 x 1014 Hz. What is the wavelengt
Olin [163]

Answer:

Explanation:

Formula and givens

  • λ = c / f
  • λ is the wavelength
  • c = the speed of light
  • f = the frequency
  • c = 3*10^8
  • f = 7.89 * 10^14

λ = ?

Solution

λ = 3*10^8 / 7.89*10^14

λ = 3*10^8/7.89*10^14

λ = 2.36 * 10^7

λ = 236 nanometers. What you use as your solution depends on what what you have been taught.

6 0
3 years ago
A soccer ball initially at rest rolls down a hill with an acceleration of 3.0 m /s2 .it accelerates for 5 seconds before melissa
slavikrds [6]
The correct answer is the Soccer ball is 3.2 plus 5 that’s your answer.
6 0
3 years ago
Other questions:
  • In two separate double slit experiments, an interference pattern is observed on a screen. In the first experiment, violet light
    10·1 answer
  • slader A uniform cylindrical grinding wheel of mass 50.0 kg and diameter 1.0 m is turned on by an electric motor. The friction i
    13·1 answer
  • What is the answer to this $10 lamp;5%tax
    10·1 answer
  • Answer the question please
    11·2 answers
  • What is the force per unit area at this point acting normal to the surface with unit nor- Side View √√ mal vector n = (1/ 2)ex +
    9·1 answer
  • Calculate the speed in m/s at which the moon revolves around the Earth. Note: the orbit is nearly circular.
    14·2 answers
  • Two solenoids are equal in length and radius, and the cores of both are identical cylinders of iron. However, solenoid A has fou
    12·2 answers
  • Which descriptions refer to cumulus clouds? Select three options.
    9·1 answer
  • A 1500 kg car accelerates at 3 m/s^2. What is the net force acting on the car?
    7·1 answer
  • Does anyone know number #1
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!