When wavelength of incident photon is decreased then

A laser pointer emits monochromatic light at a wavelength of 650 nm with a power output of 1 mW. How many photons are emitted by the laser per second? (Planck's constant $h = 6.6 imes 10^{-34}$ Js)

The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is $\left( {hc\; = 1240\;eV - {\rm{nm}}} \right)$

In a photoelectric effect experiment, the slope of the graph between the stopping potential and the incident frequency will be

How many photons are emitted by a laser source of $5 imes {10^{ - 3}}\;{\rm{W}}$ operating at 632.2 nm in 2s?

A source emits monochromatic light of wavelength 600 nm with a power of $3.3 imes 10^{-3}$ W. Calculate the average number of photons emitted per second. (Given: $h = 6.6 imes 10^{-34}$ Js)

The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is $\left( {hc\; = 1240\;eV - {\rm{nm}}} \right)$

Which one of the following statements regarding photo-emission of electrons is correct?

While doing his experiment, Millikan one day observed the following charges on a single drop(i)$6.563 imes {10^{ - 19}}C$ (ii) $8.204 imes {10^{ - 19}}C$(iii)$11.50\; imes {10^{ - 19}}C\;$ (iv)$13.13 imes {10^{ - 19}}C$(v)$16.48 imes {10^{ - 19}}C\;\;$ (vi)$18.09 imes {10^{ - 19}}C$From this data the value of the elementary charge $\left( e \right)$ was found to be

Which factor affects the maximum kinetic energy of photoelectrons emitted in Lenard's experiment?

Air becomes conducting when the pressure ranges between