multiple choice question - momentum/particle physicsWatch

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#1
An electron gun uses a potential difference to accelerate electrons from rest to a speed of 2.00×10^7 ms–1.
The potential difference is
A 569 V
B 1140 V
C 2280 V
D 4560 V

Thankyouu
0
5 years ago
#2
(Original post by pureandmodest)
An electron gun uses a potential difference to accelerate electrons from rest to a speed of 2.00×10^7 ms–1.
The potential difference is
A 569 V
B 1140 V
C 2280 V
D 4560 V

Thankyouu
Potential difference is work done per unit charge.

Calculate the work done.
Divide by the charge of an electron.

Make sense?
0
#3
(Original post by usycool1)
Potential difference is work done per unit charge.

Calculate the work done.
Divide by the charge of an electron.

Make sense?

how do i work out the work done :c?
sorry, physics isn't my strong point
0
5 years ago
#4
(Original post by pureandmodest)
An electron gun uses a potential difference to accelerate electrons from rest to a speed of 2.00×10^7 ms–1.
The potential difference is
A 569 V
B 1140 V
C 2280 V
D 4560 V

Thankyouu
You need the mass of the electron from your data sheet or from the question.
Work out its kinetic energy from the speed it attains.

A charge q moving through a pd of V volts gains Vq amount of energy.

Combine these two ideas to find V. (You know q for the electron.)
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