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ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics
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Total Questions30
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Time Allowed30
ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics
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Question # 1
A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is
Question # 2
When a platinum wire is heated, it appears yellow at
Question # 3
The inside cavity of the black body is
Question # 4
If the radius of first orbit of hydrogen atom is 0.53° A the radius of second orbit will be
Question # 5
The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum
Question # 6
The intensity of emitted energy (with wavelength) radiated from a black body at different temperatures was initially measured by:
Question # 7
Strictly speaking, the earth is:
Question # 8
The way through which electromagnetic radiations or photons interact with matter depends upon their:
Question # 9
In the compton's effect, it is found that the wavelength of incident x-rays is
Question # 10
A photon is considered to have
Question # 11
Compton studied the scattering of x-rays by loosely bound electrons from:
Question # 12
The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as
Question # 13
The existence of position was predicted by Dirace in
Question # 14
The length contraction happens only
Question # 15
The threshold frequency of sodium is 6 x 106MHz. The cut-off wavelength for this metal will be
Question # 16
Which of the following phenomenon proves the particle nature of light
Question # 17
The concept of direction is purely:
Question # 18
Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in
Question # 19
According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body
Question # 20
According to the special theory of relativity
Question # 21
The emission of electrons from a metal surface when exposed to light of suitable frequency is called the
Question # 22
When a platinum wire is heated, it appears white at
Question # 23
A black body is
Question # 24
When a position comes close to an electron they annihilate into photons such that
Question # 25
According to Einstein, with the great increase in the speed of the body the relativistic length of the body
Question # 26
The energy of the 4th orbit in hydrogen atom is
Question # 27
In order to produce pair production, a photon must have a energy
Question # 28
Photocell is a device which converts
Question # 29
The unit of work function is:
Question # 30
With the help of 50 K v electron microscope, a resolution of
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