A laser beam has a wavelength of `7 xx 10^(-7) m` and aperure `10^(-2)m`. The beam is sent to moon at a distance of `4 xx 10^(5) km` from earth. Find the angular spread and areal spread of the beam on reaching the moon.

A laser beam having lamda=7000 Å and aperture d=10^(-2)m is sent to the moon. What is the angular spread of the beam?

The moon is 4xx10^(8)m from the earth. A radar signal transmitted from the earth will reach the moon in about

A laser operates at a frequency of 3xx10^(14) Hz and has an aperture of 10^(-2) m. What will be the angular spread ?

Mass of moon is 7.3 xx 10^(22) kg and its radius is 1.74 xx 10^(6) m. Find the value of the acceleration due to gravity on the moon.

A parallel beam of light of wavelength 4000 Å passes through a slit of width 5 xx 10^(-3) m . The angular spread of the central maxima in the diffraction pattern is

A laser beam of 7,500 Å is sent from a lunar rover on the moon. If laser beam passes through an aperture of 0.8 cm, calculate the angular spread of diffracted beam on reaching the Earth. The distance between the Earth and the moon is 4 xx 10^5 km .

A laser beam has intensity 2.5 xx (10^14)W (m^-2). Find the amplitudes of electric and magnetic fields in the beam.

A high-powered laser beam (lambda=600nm) with a beam diameter of 10 cm is aimed at the Moon, 3.8xx10^(5)km distant. The beam spreads only because of diffraction. The angular location of the edge of the central diffraction disk is given by sintheta=(1.22lambda)/(d) , where d is the diameter of the beam aperture. What is the diameter of the central diffraction disk on the Moon's surface?