SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A hydrogen atom, initially in the ground state is excited by absorbing a photon of wavelength 980. The radius of the atom in the excited state, it terms of Bohr radius a0, will be: (hc= 12500 eV

(a)

9a0

(b)

25a0

(c)

4a0

(d)

16a0


Question ID - 50290 :-

A hydrogen atom, initially in the ground state is excited by absorbing a photon of wavelength 980. The radius of the atom in the excited state, it terms of Bohr radius a0, will be: (hc= 12500 eV

(a)

9a0

(b)

25a0

(c)

4a0

(d)

16a0

1 Answer
5876 Votes
3537

Answer Key : (d) -

Energy of photon==12.75eV

∴Electron will excite to n=4 since ‘R’∝ n2

∴Radius of atom will be 16a0



Next Question :

A liquid of density ρ is coming out of a hose pipe of radius a with horizontal speed v and hits a mesh. 50% of the liquid passes through the mesh unaffected. 25% looses all of its momentum and 25% comes back with the same speed. The resultant pressure on the mesh will be:

(a)

 v2

(b)

(c)

(d)


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