A 100 W 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 589 nm
At what rate are the photons delivered to the sphere ?

A 100 W 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 589 nm What is the energy per photon associated with the sodium light ?

The wavelength of light from the spectral , emission line of sodium is 589 nm. Find the kinetic energy at which, a neutron would have the same de Broglie wavelength .

The wavelength of light from the spectral , emission line of sodium is 589 nm. Find the kinetic energy at which, an electron would have the same de Broglie wavelength .

A modern 200 W sodium street lamp emits yellow light of wavelength 0.6 mum . Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is

Yellow light emitted from a sodium lamp has a wavelength (lambda) of 580 nm. Calculate the frequency (v) and wave number (barv) of the yellow light.

Light of intensity 10^ −5 W/m 2 falls on a sodium photo-cell of surface area 2 cm^ 2 . Assuming that the top 5 layers of sodium absorb the incident energy, estimate time required for photoelectric emission in the wave-picture of radiation. The work function for the metal is given to be about 2 eV. What is the implication of your answer?