A laser beam of output power 'P' consists only of wavelength `lambda`. If Planck's constant is `h` and the speed of light is `c`, then the number of photons emitted per second is

The energy of a photon of wavelength lambda is [ h = Planck's constant, c = speed of light in vacuum ]

Photons of wavelength 660 nm are emitted from a 60 watt lamp. What is the number of photons emitted per second ?

Photons of wavelength 660 nm are emitted from a 60 watt lamp. What is the number of photons emitted per second ?

A 100 wart bulb emits monochromatic light of wavelength 400 bn, Calculate the number of photons emitted per second by the bulb.

A 200 W bulb emits monochromatic light of wavelenght 1400 A and only 10% of the energy is emitted as light. The number of photons emitted by the bulb per second will be

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 100 watt bult emits monochromatic light of wavelength 400 nm. Calcualte the number of photons emitted per second by the bulb.

A 100 watt bult emits monochromatic light of wavelength 400 nm. Calcualte the number of photons emitted per second by the bulb.