If 5% of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per second by a 100 W lamp? Assume wavelength of visible light as `5.6xx10^(-5)` cm.

If 15% of the energy supplied to a bulb is radiated as visible light, how many quanta are emitted per second by a 100 watt lamp ? Assume that the wavelength of visible light is 5600 Å .

6% of the energy supplied to a 100 watt lamp is radiated as visible light of wavelength 6620 Å. How many quanta are emiited per second ?

If 10% of the energy supplied to an incandescent light bulb is radiated as visible light, how many visible light photons are emitted by 200watt bulb? Assume wavelength of all visible photons to be 5000Å. Given h=6.6xx10^(-34)Js .

How many photons are emitted per second by a 5m W laser source operating at 632.8nm?

Only a fraction of the electrical energy supplied to a tungsten light bulb is converted into visible light. If a 100 W light bulb converts 20% of the electrical energy into visible light (lambda=662.6nm) , then the number of photons emitted by the bulb per second is

A lamp mainly emits light of wavelength lambda . The lamp is rated at P watt and 8% of the energy is emitted as visible light. (i) How many photons of light are emitted by the lamp per second? (ii) How many photons are falling per second on a square whose length of each side is a, held perpendicular to the incident photons at a distance r from the lamp.

The number of photons emitted per second by a 60 W source of monochromatic light of wavelength 663 nm is: (h=6.63xx10^(-34)Js )

A 124 W bulb converts only 15 % of the energy supplied to it into visible light of wavelength 640 nm . How many photons are emitted by the light bulb in one second ?

A 100 W light bulb is placed at the centre of a spherical chamber of radius 20cm. Assume that 60% of the energy supplied to the bulb is converted into light and that the surface of the chamber is perfectly absorbing. Find the pressure exerted by the light on the surface of the chamber.