Question -
Answer -
Wavelength of the monochromatic light,┬а╬╗┬а=632.8 nm = 632.8 ├Ч 10тИТ9┬аm
Power emitted by the laser,┬аP┬а=9.42 mW = 9.42 ├Ч 10тИТ3┬аW
PlanckтАЩs constant,┬аh┬а=6.626 ├Ч 10тИТ34┬аJs
Speed of light,┬аc┬а= 3 ├Ч 108┬аm/s
Mass of a hydrogen atom,┬аm┬а=1.66 ├Ч 10тИТ27┬аkg
(a)The energy of each photonis given as:
The momentum of eachphoton is given as:
(b)Number of photons arrivingper second, at a target irradiated by the beam =┬аn
Assume that the beam has auniform cross-section that is less than the target area.
Hence, the equation forpower can be written as:
(c)Momentumof the hydrogen atom is the same as the momentum of the photon,┬а
Momentum is given as:
Where,
v┬а= Speed of the hydrogen atom
