Find the momentum of a photon of wavelength `0.01 oversetcircA`.

What is the momentum of a photon of frequency v?

What is the ratio of velocity of light of wavelengths 4000 oversetcircA and 8000 oversetcircA in vacuum?

Find the number of photons emitted per second by a 25 W source of monochromatic light of wavelength 6000 oversetcircA .

A double slit is illumnated by light of wavelengths 6000 oversetcircA . The slits are 0.1 cm apart and screen is placed 1.5 m. away. Calculate the angular position of 9th maximum in radian.