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JEE Physics Solved Question Paper 2016

Multiple Choice Questions

51.

The variation of photocurrent with collector potential for different frequencies of incident radiation v₁, v₂ and v₃ is as shown in the graph, then

v₁ = v₂ = v₃
v₁ > v₂ > v₃
v₁ < v₂ < v₃
$v_{3} = \frac{v_{1} + v_{2}}{2}$

52.
The de-Broglie wavelength of an electron accelerated to a potential of 400 V is approximately

0.03 nm

0.04 nm

0.12 nm

0.06 nm

0.06 nm

Voltage, V = 400 V

Since, de-Broglie wavelength of an electron

$λ = \frac{12.3}{\sqrt{V}} \overset{\circ}{A} = \frac{12.3}{\sqrt{400}} \overset{\circ}{A} = \frac{12.3}{20} \overset{\circ}{A} = 0.615 \overset{\circ}{A} λ = 0.0615 nm$

53.

Total energy of electron in an excited state of hydrogen atom is − 3.4 eV. The kinetic and potential energy of electron in this state are

K = − 3.4 eV, U = − 6.8 eV
K = 3.4 eV, U − 6.8 eV
K = − 6.8 eV, U = + 3.4 eV
K = + 10.2 eV, U = − 13.6 eV

54.

When electron jumps from n = 4 level to n = 1 level, the angular momentum of electron changes by

$\frac{h}{2 π}$
$\frac{2 h}{2 π}$
$\frac{3 h}{2 π}$
$\frac{4 h}{2 π}$

55.

A radioactive sample of half-life 10 days contains 1000 x nuclei. Number of original nuclei present after 5 days is

707 x
750 x
500 x
250 x

56.

An element X decays into element Z by two-step process

$X \overset{}{\to} Y + {}_{2}^{4}{He} Y \overset{}{\to} Z + 2 e^{-}, then$

X and Z are isobars
X and Y are isotopes
X and Z are isotones
X and Z are isotopes

57.

A nucleus of mass 20 u emits a γ-photon of energy 6 MeV. If the emission assume to occur when nucleus is free and rest, then the nucleus will have kinetic energy nearest to (Take, 1 u = 1.6 × 10^-27 kg)