WorksheetsUnit V - Quantum Physics
Total questions: 25
Worksheet time: 13mins
As the wavelength of the radiation decreases, the intensity of the black body radiations
Increases
Decreases
First increases then decrease
First decreases then increase
The radiations emitted by hot bodies are called as
X-rays
Black-body radiation
Gamma radiations
Visible light
An iron rod is heated. The colors at different temperatures are noted. Which of the following colors shows that the iron rod is at the lowest temperature?
Red
Orange
White
Blue
A black body is defined as a perfect absorber of radiations. It may or may not be a perfect emitter of radiations.
True
False
From the figure, what’s the relation between T1, T2, and T3?
T1 > T2 > T3
T3 > T2 > T2
T3 > T1 > T2
T2 > T1 > T3
Electromagnetic wave theory of light could not explain Black Body radiations.
True
False
The energy emitted by a black surface should not vary in accordance with
Wavelength
Temperature
Surface characteristics
Time
The law governing the distribution of radiant energy over wavelength for a black body at fixed temperature is referred to as
Kirchhoff’s law
Planck’s law
Wein’s formula
Lambert’s law
The Planck’s constant h has the dimensions equal to
M L 2 T -1
M L T -1
M L T -2
M L T
The energy distribution is not uniform for any given temperature in a perfect black body.
True
False
Rayleigh-Jean’s law holds good for which of the following?
Shorter wavelength
Longer wavelength
High temperature
High energy
Wien’s displacement law holds good only for shorter wavelength.
False
True
Which of the following does not affect the photon?
Magnetic or electric field
Light waves
Gravity
Current
What is Compton shift?
Shift in frequency
Shift in charges
Shift in radiation
Shift in wavelength
Compton shift depends on which of the following?
Incident radiation
Nature of scattering substance
Angle of scattering
Amplitude of frequency
Which of the following is associated with an electron microscope?
Matter waves
Electrical waves
Magnetic waves
Electromagnetic waves
Calculate the de-Broglie wavelength of an electron which has been accelerated from rest on application of potential of 400volts.
0.1653 Å
0.5125 Å
0.6135 Å
0.2514 Å
In which medium sound travels faster?
Solid
Liquid
Gas
Water vapour
TEM and SEM are the same microscopy techniques.
True
False
The resolving power of TEM is derived from
electrons
specimens
power
ocular system
Image formation in electron microscope is based on
column length
electron number
differential scattering
specimen size
Which of the following can be a wave function?
tan x
sin x
cot x
sec x
Which of the following is not a characteristic of wave function?
Continuous
Single valued
Differentiable
Physically Significant
The Schrödinger is a differential equation.
True
False
The wave function of the particle lies in which region?
x > 0
x < 0
0 < X < L
x > L
