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CBSE

NEET Physics : Dual Nature of Radiation and Matter

Multiple Choice Questions

61.

Light of frequency v falls on material of threshold frequency v_o, Maximum kinetic energy of emitted electron is proportional to

ν - ν_o
ν
$\sqrt{v - v_{o}}$
v_o

62.

A vessel of height 2 d is half filled with a liquid of refractive index $\sqrt{2}$ and the other half with a liquid of refractive index n (the given liquids are immiscible). Then, the apparent depth of the inner surface of the bottom of the vessel (neglecting the thickness of the bottom of the vessel) will be

$\frac{n}{d (n + \sqrt{2})}$
$\frac{d (n + \sqrt{2})}{n \sqrt{2}}$
$\frac{\sqrt{2} n}{d (n + \sqrt{2})}$
$\frac{nd}{d + \sqrt{2 n}}$

63.

Relation between wavelength of photon and electron of same energy is

λ_ph> λ_e
λ_ph < λ_e
λ_ph = λ_e
$\frac{λ_{e}}{λ_{ph}}$ = constant

64.

If alpha, beta and gamma rays carry same momentum, which has the longest wavelength?

Alpha rays
Beta rays
Gamma rays
None all have same wavelength

65.

Flash light equipped with a new set of batteries, produces bright white light. As the batteries wear out

the light intensity gets reduced with no change in its colour
light colour changes first to yellow and then red with no change in intensity
it stops working suddenly while giving white light
colour changes to red and also intensity gets reduced

66.

Light travels faster in air than that in glass. This is accordance with

wave theory of light
corpuscular theory of light
neigther (a) nor (b)
Both (a) and (b)

67.

The work function for metals A, Band C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photo, electrons for a radiation of wavelength 4100 A^o is/are

none
A only
A and B only
All the three metals

68.

Which one of the following graph represents the variation of maximum kinetic energy (Ek) of the emitted electrons with frequency v in photoelectric effect correctly?