A transformer is needed to convert a mains 240 V supply into a 12 V supply it there are 200 turns on the primary coil, how many turns should there be on the secondary coil.
In a spectrometer experiment monochromatic light is incident normally on a diffraction gratin having 4.5 x 105 lines per metre The second order line is seen at an angle of 30 o to The normal What is the wavelength of the light.
For polarization , the direction of oscillation has to be perpendicular to the direction of travel sound waves are longitudinal waves so they cannot be.
