Find
the number of photons wmitted er minute by 60 W lamp of moochromatic light of wavelength `5,000 overset @A`.

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

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

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.

The two slits in Young's double slit experiment are seprated by a distance of 0.03 cm.When light of wavelength 5,000 overset@A falls on the slits,nd interference pattern is produced on the screen 1.5 m away.Find the distance of 4th bright fringe from the central maximum.

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.

Determine the angular separation betwen central maximum and first order maximum of the difraction pattern due to a single slit of width 0.25 mm,when light of wavelength 5,890 overset@A is incident on it normally.

Young's double - slit experiment for interference is performed with two slits 3xx 10^(-3) m apart and light of wavelength 6,600 overset @A . If the screen is 1 m away from the slits,find out the position of the fourth dark fringe.

A beam of light consisting of two wavelegnths, 6,500 overset @A and 5,200 overset @A is used to obtain interfrerence fringes in a Young's double slit experirmejnt.The distance between the slits and the screen is 120 cm. Find the distance of third bright fringe on the screen from the central maximum for the wavelength 6,500 overset @A .