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

Find the number of photon emitted per minute by 60 what lamp of monochromatic light of wavelength 5000 overset @A

Estimating the following two numbers should be interesting. The first number will tell you why radio engineering do not need to worry much about photons. The second number tells you why our eye can never count photons, even in barely detetable light. The number of photons emitted per second by a MW transmitter of 10 kW power emitting radio waves of wavelength 500 m.

Find the momentum of a photon of wavelength 0.01 oversetcircA .

Three photo diodes D_1 , D_2 and D_3 are made of semiconductors having band gaps of 2.5 eV, 2eV and 3eV, respectively. Which ones will be able to detect light of wavelength 6000 oversetcircA ?

In a Young's double slit experiment,two slits are 1.5 mm apart and a screen in placed at a distance 1.2 m from the plane of the slits .The slits are illuminated with light of wavelength 6,000 overset @A .Find the inimum distance from the central maximum for which the intensity is half of the maximum intensity.

The number of photons of light having wave number 'x' in 10 J of energy source is :