A 100 watt bulb emits electro-magnetic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

A 25 What bulb emits monochromatic yellow light of wavelength of 0. 75 um. Calculate the rate of emission of quanta per second.

Yellow light emitted from a sodium lamp has a wavelength of 480 nm. Calculate the wavenumber of this light.

In a photoelectric effect set up, a point source of light of power 3.2 xx10^(-3) W emits monoenergetic photons of energy 5eV.The source is located at a distance of a stationary metallic sphere of work function 3eV and radius 8xx10^(-3)m .The efficiency of photoelectron emission is one for every 10^(6) incident photons.Assume that the sphere is isolated and initially neutral and the photoelectrons are initially swept away after emission. Calculate the number of photoelectrons emitted per second.

Yellow light emitted from a sodium lamp has a wavelength of 480 nm. Calculate the frequency of this light.

Estimating the following two numbers should be interesting. The first number will tell you why radio engineering do not need to worry much about photons. The second number tells you why our eye can never count photons, even in barely detetable light. The number of photons emitted per second by a MW transmitter of 10 kW power emitting radio waves of wavelength 500 m.

A metal has work function 5eV. Will this metal emit electrons, when light of wavelength 400 nm falls on it?