MCQs of Atoms

Atoms MCQs

Showing 141 to 146 out of 146 Questions

141.

Number of spectral line in hydrogen atom is _____.

(a)	6
(b)	15
(c)	8
(d)	∞

142.

An alpha particle of energy 5 MeV is moving forward for a head on collision. The distance of closest approach from the nucleus of atomic number Z = 50 is _____× 10-14 m.(k = 9 × 10⁹ SI,e = 1.6 × 10^-19 C,1 eV = 1.6 × 10^-19 J)

(a)	2.88
(b)	1.44
(c)	0.72
(d)	5.76

143.

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be _____.

(a)	$\frac{24 h R}{25 m}$
(b)	$\frac{25 h R}{24 m}$
(c)	$\frac{25 m}{24 h R}$
(d)	$\frac{24 m}{25 h R}$

144.

Ratio of longest wave length corresponding to Lyman and Balmer series in hydrogen spectrum is _____.

(a)	$\frac{5}{27}$
(b)	$\frac{3}{23}$
(c)	$\frac{7}{29}$
(d)	$\frac{9}{31}$

145.

Hydrogen atom in ground state is excited by a monochromatic radiation of λ = 975 Å . Number of spectral lines in the resulting spectrum emitted will be _____.

(a)	3
(b)	2
(c)	6
(d)	8

146.

When an α-particle of mass 'm' moving with velocity 'v' bombards on a heavy nucleus 'Ze', its distance of closest approach from the nucleus depends on m as _____ .

(a)	$\frac{1}{m^{2}}$
(b)	$m$
(c)	$\frac{1}{m}$
(d)	$\frac{1}{\sqrt{m}}$

Showing 141 to 146 out of 146 Questions