A laser operates at frequency `3xx10^(14)Hz` and has an aperture of size 1 cm. Calculate the angular spread in the beam due to diffraction.

In a cyclotron to accelerate proton, the magnetic field is 15,000 gauss and radius of the dees is 15 cm. Calculate the energy of the proton beam and the frequency of the oscillator. Take e/m for proton to be 9,580.84 e.m.u g^-1 and mass of proton = 1.67 xx 10^-24 g

Two wavelengths of sodium light of 590 nm nd 596 nm are used in turn to study the diffraction taking place at a single slit of aperture 2 xx 10 ^(-6)m .Calculate the separation between the positions of first maxima of the diffraction pattern obtained in the two cases.

A radar trnsmitter genrates waves,whose frequency is 3 xx 10^9 Hz.What is the wavelength of the waves?

In a plane e.m. wave, the magnetic field oscillates sinusodially with a frequency of 3xx 10^(10)Hz and amplitude 128 nT. What is the amplitude of the oscillating electric field?

A semiconductor has electron concentration of 4xx10^12 cm^-3 and hole concentration of 7xx10^-3 cm^-3 . Calculate conductivity of the semicouductor if electron mobility = 22000 cm^2V^-1 s^-1 and hole mobility = 150cm^2V^-1s^-1 .