Question

The wavelength of electron waves in two orbits is 3 : 5. The
ratio of kinetic energy of electrons will be
(a) 25 9
(b) 5:3
(c) 9:25
(d) 3.5
​

Answer 1

Explanation:

From de-Broglie's equation:

λ=mvh

⇒λ2=m2v2h2 

⇒mv2=mλ2h2

∵KE(K)=21mv2

∴KE(K)=21mλ2h2

⇒K2K1=(λ1λ2)2=(35)2

∴K1:K2=25:9.

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