List of top Physics Questions on Photoelectric Effect asked in JIPMER

The number of photons of wavelength of 540 nm emitted per second by an electric bulb of power 100 W is (Given $h ={ 6 \times 10^{-34} \,J \, s})$

If work function of a metal is $4.2\,eV$, the cut off wavelength is:

When light of wavelength 300 nm falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters: