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Q.

When an excited H atom goes to ground state it emits a photon. Statement 1 : Mass has changed into energy. Statement 2 : K.E. has increased.

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a

Both 1 and 2 are true

b

Both 1 and 2 are false

c

Only 1 is true

d

Only 2 is true

answer is D.

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Detailed Solution

Mass remains unchanged. KE of electron = +13.6 n2 ev
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