A 100 W sodium lamp is radiating light of wavelength `5890A`, uniformly in all directions,
a. At what rate, photons are emitted from the lamp?
b. At what distance from the lamp, the average flux is 1 photon(`cm^2-s)^-1?`
c. What are the photon flux and photon density at 2m from the lamp?

A 160 watt infrared source is radiating light of wavelength 50000Å uniformly in all directions. The photon flux at a distance of 1.18 m is of the order of -

A 160 watt light source is radiating light of wavelength 6200 Å uniformly in all directions. The photon flux at a distance of 1.8 m is of the order of (Planck's constant 6.63xx 10^(-34) J-s)

A 160 watt light source is radiating light of wavelength 6200 Å uniformly in all directions. The photon flux at a distance of 1.8 m is of the order of (Plank's constant 6.62 xx 10^(-34) J-s )

A lamp radiates power P_(0) uniformly in all directions, the amplitude of elctric field strength E_(0) at a distance r from it is

10^(20) photons of wavelength 660 nm are emitted per second from a lamp . What is the wattage of the lamp ?

What is the highest frequency of a photon that can be emitted from a hydrogen atom ? What is the wavelength of this this photon ?

A 20 W lamp rated 10% emits light of wavelength y. Calculate the number of photons emitted by the lamp per second.

A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589nm. (a) What is energy associated per photon with the sodium light? (b) At what rate are photons delivered to the sphere?

A 60 W bulb is placed at a distance of 4 m from you. The bulb is emtting light of wavelength 600 nm uniformly in all directions. In 0.1 s, how many photons enter your eye if the pupil of the eye is having a diameter of 2mm? [take hc=1240eV-nm]