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1.
An X-ray tube with a copper target emits 
line of wavelength 
What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of 
rays
line of wavelength What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of rays2.
A photon in motion has a mass
3.
The intensity of X-rays from a coolidge tube is plotted against wavelength 
as shown in figure. The minimum wavelength found is 
and the wavelength of 
like is 
. As the accelerating voltage is increased
as shown in figure. The minimum wavelength found is and the wavelength of like is . As the accelerating voltage is increased
4.
and 
are the de Broglie wavelengths of electron, proton and 
particle. If all are accelerated by same potential, then
and are the de Broglie wavelengths of electron, proton and particle. If all are accelerated by same potential, then
5.
If 
and 
are the acceleration due to gravity on the surfaces of the earth and the moon respectively and it Millikan's oil drop experiment could be performed on the two surfaces, one will find the ratio 
to be
and are the acceleration due to gravity on the surfaces of the earth and the moon respectively and it Millikan's oil drop experiment could be performed on the two surfaces, one will find the ratio to be
6.
The value of stopping potential in the following diagram
7.
Work function of a metal is 
Its threshold frequency
Its threshold frequency
8.
The cathode rays have particle nature because of the fact that
9.
The de-Broglie wavelength associated with the particle of mass 
moving with velocity 
is
moving with velocity is
10.
The continuous X-rays spectrum produced by an X-ray machine at constant voltage has