The intensity of a laser beam is `5 xx 10^14 Wm^-2`. Calculate the amplitudes of electric and magnetic field in it.

A point charge of 3 xx 10^(-9)C is released from rest in a uniform electric field and moves a distance of 5cm after which its kinetic energy becomes 4.5 xx 10^(-5)J . Calculate the magnitude of the electric field.

The frequency of the strong yellow line in the spectrum of sodium is 5.09xx10^14 sec^(-1) . Calculate the wavelength of this light.

The angle of dip at a place is 60^@ N. find the value of the total intensity of the earth's magnetic field. [Given H = 3.6 xx 10^-5 Tesla ]