Question

66.
4) Velocity
The number of wavelengths per cm is called
1) Wavelength
2) Wave number 3) Amplitude
The height of crest (or) depth of trough of a wave is called
1) Wavelength
2) Amphitude 3) Wave number
67.
4) None
68.
69.
In electromagnetic radiation, which of the following has greater wavelength than
visible light
1) U.V rays
2) I.R rays
3) Gamma rays
4) X-rays
Photo electric effect is observed in case of
1) Caesium
2) Magnesium 3) Aluminium 4) Non
The minimum frequency of light required to eject the electrons from an atom is called ...
1) Threshold frequency
2) Chemical frequency
3) Kinetic energy
4) None
70.​

Answer 1

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