The momentum of each photon in the light beam is 1.046×10⁻²⁷ kgms⁻¹
λ= 632.8nm=632×10⁻⁹ m
Power, P=9.42mW=9.42×10 ⁻³W
Energy of each photon in the light beam,
E= (hc)/λ =
(6.6×10 ⁻³⁴×3×10 ⁸) / 632.8×10⁻¹⁹ = 3.14×10 ⁻¹⁹ = (3.14×10 ⁻¹⁹)/1.6 x 10⁻¹⁹
= 1.963ev
The momentum of each photon in the light beam,
p = h/λ = (6.6×10 ⁻³⁴)/(632×10⁻⁹ ) = 1.046×10⁻²⁷ kgms⁻¹
Momentum is a measurement of mass in motion: how much mass is in how much motion. It is usually given the symbol p. Where m is the mass and v is the velocity.
Example - Whenever you toss a ball at someone as well as it smacks him square in the face. It indicates how difficult it would have been to stop the thing. A baseball is swooping through the air. A large truck is moving. A bullet discharged from such a firearm.
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