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## Main Question or Discussion Point

This thing has troubled me for a long time.. but i think this is eventually starting to get clear to me.

When we say a photon has a momentum 'p', the momentum isn't it's mass times the velocity.. but it can be interpreted as: If the photon [having frequency [itex]f_1[/itex]] collides with any other particle, and an elastic collision takes place.. and it's frequency now is [itex]f_2[/itex], then the momentum imparted to the particle is: [tex]\Delta p = \frac{h}{c}(f_2 - f_1)[/itex]

am i right?

When we say a photon has a momentum 'p', the momentum isn't it's mass times the velocity.. but it can be interpreted as: If the photon [having frequency [itex]f_1[/itex]] collides with any other particle, and an elastic collision takes place.. and it's frequency now is [itex]f_2[/itex], then the momentum imparted to the particle is: [tex]\Delta p = \frac{h}{c}(f_2 - f_1)[/itex]

am i right?

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