An 80 watt bulb emits monochromatic light of wavelength 480 nm. Calculate the number of photons emitted per second by the bulb?

A 25 watt bulb emits monochromatic yellow light of wavelength of 0.57 mum . Calculate the rate of emissionn of quanta per second.

A monochromatic source, emitting light of wavelength, 600 nm, has a power output of 66W. Calculate the number of photons emitted by this source is 2 minutes.

A bulb emits 2 xx 10^20 photons of wave length 400 nm in one second. Calculate the rate of emission of photons per second.

A 5 W point source emits monochromatic light of wave length 5000Å How many photons per second strike a unit area placed 5m away from the source and illuminated by it?

A photoelectric source is illuminated successively by monochromatic light of wavelenth lamda and (lamda)/(2) . Calculate the work function of material of the source if the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case.

The ratio of the power of two sources of light is 2 and the ratio of wavelengths of the emerging monochromatic beam is also 2. What is the ratio of number of photons emitted per second.

A 5 W point source emits monochromatic light of wave length 500Å What should be the work function of the meal from whose surface this light can liberate photoelectrons?

A narrow slit of 2 mm width is illuminated by a monochromatic light of wavelength 500 nm. What would be the intermediate distance between two first minima on either side of a screen kept 1m away?

Estimating the following number should be interesting. The number will tell you why radio engineers need not worry much about photons. The number of photons emitted per second by a medium wave transmitter of 10 kW power, emitting radiowaves of wave-length 500 m.