b-Ray
a-Ray
X-Ray
g-Ray
The Length of the Day is determined in
The lens used in a simple microscope is
The light rays used for eliminating bacteria
The lightest radioactive element is
The liquid metal is
The locomotion of insects to the source of light is called :
The long range potential of nuclear energy in India depends on its reserves of
The loudness of a sound wave is determined by its
The loudness of sound depends upon
The magnifying power of an astronomical telescope can be decreased by
