Short Answer TypeA ray of light is incident on a transparent medium at polarising angle. What is the angle between the reflected ray and the refracted ray?
How does the focal length of a convex lens change with increase in wavelength of the incident light?
With reference to the photoelectric effect, what is meant by the threshold wavelength?
Threshold wavelength is the maximum wavelength of incident or ultra violet radiation which causes emission of electrons.
OR
The wavelength of light having the minimum energy required for the emission of electrons.
Half life of a certain radioactive element is 3.465 days. Find its disintegration constant.
Binding energy per nucleon for helium nucleus 
is 7.0 MeV. Find the value of mass defect for helium nucleus.
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