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A question from Kinetic energy

Atul asked:

A lorry and a car moving with the same KE are brought to rest having same retarding force .which one of them should come at rest at shorter distance.

 

Ans:

According to Work Kinetic Energy theorem

Both should stop travelling the same distance

(This was a quick answer without a deep thought. If the readers have a diffrent opinion, please comment)

A question from photoelectric effect

Jyothir Asked:

In photoelectric effect, what happens to the photon after it collides elastically with the electron ?

 

Ans:

The photon is completely absorbed by one electron, the energy of the electron provides the work function which is equal to the binding energy of the electron and the balance energy appears as the electrons Kinetic energy.

As Einstein’s Photo electric equation suggests

KE = h (v-vo)

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