Question

Light of two different frequencies whose photons have energies 1eV and 2.5eV successively illuminate a metal of work function 0.5 eV.The ratio of the maximum speeds of the emitted electrons will he

A

1 : 5

B

1 : 4

C

1 : 2

D

1 : 1

Medium

Solution

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Correct option is C)

For maximum speed of the photo electrons  
where eV is the work function of the metal.
Energy of photon
 
We get   eV        ....(1)
Energy of photon
 
We get   eV        ....(2)
Ratio of maximum speeds  
We get   

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Solution To Question ID 639278
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