Question

In PEE value of kmax is equal to knots if the frequency of light is double then kmax is 3knots if frequency is 3 times find kmax

Answer 1

Answer:

Kinetic energy of electron becomes 5 times the initial value of kinetic energy

Explanation:

As we know by equation of photo electric effect

$hf = \phi_o + K$

now when frequency of light is double then kinetic energy is 3 times the initial value

so we have

$2hf = \phi_o + 3K$

now we have

$2(\phi_o + K) = \phi_o + 3K$

$\phi_o = K$

now if frequency is 3 times then we have

$3hf = \phi_o + KE$

$3(2K) = K + KE$

$KE = 5 K$

#Learn

Topic : Photo electric effect

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