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Q1.

An electron of a stationary Hydrogen atom transitions from the fifth energy level to the ground level. The velocity that the atom acquires as a result of photon emission is ( $m=$ mass of the atom,$R=$ Rydberg's constant,$h=$ Planck's constant).

(A)

$\frac{24 Rh}{25 m}$

(B)

$\frac{25 Rh}{24 m}$

(C)

$\frac{25 m}{24 Rh}$

(D)

$\frac{24 m}{25 Rh}$

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Q2.

The electron in a hydrogen atom is initially in the second excited state. When it finally moves to the ground state, the maximum number of spectral lines emitted are:

(A)

$2$

(B)

$3$

(C)

$4$

(D)

$5$

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