Answer:
The velocity of the photo electron is
.
Explanation:
Given that,
Supplied energy, 
Minimum energy of the electron to escape from the metal, 
We need to find the velocity of the photo electron. The energy supplied by the photon is equal to the sum of minimum escape energy and the kinetic energy of the escaping electron. So,

The formula of kinetic energy is given by :

So, the velocity of the photo electron is
.
Answer:
i think it is iron
Explanation:
its the only one that makes sense to me
Work=f.d
Work=100*50 = 500
Power = work/time = 500/4
=125 watt
Answer:
you are making an observation that uses numbers.
Explanation: