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Q.

Let K1 and K2 be the maximum kinetic energies of photo-electrons emitted when two monochromatic beams of wavelength λ1 and λ2, respectively are incident on a metallic surface. If λ1=3λ2 then :

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a

K1>K23

b

K1=K23

c

K2=K13

d

K1<K23

answer is B.

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Detailed Solution

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hcλ1−ϕ=K1hcλ2−ϕ=K2λ1=3λ23K1=3hcλ1−3ϕ3K1=hcλ2−3ϕ3K1=K2−2ϕ3K1<K2K1<K23

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