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In this lesson, we will learn how to calculate the momentum of a photon given its frequency or wavelength.

Q1:

What is the momentum of a gamma-ray photon with a wavelength of 4.00×10 m? Use a value of 6.63×10 J⋅s for the Planck constant. Give your answer to 3 significant figures.

Q2:

What is the momentum of a photon that has a wavelength of 500 nm? Use a value of 6.63×10 J⋅s for the Planck constant. Give your answer to 3 significant figures.

Q3:

A solar sail is a proposed method of spacecraft propulsion that uses the momentum of photons as a source of thrust. When photons hit the sail, they are absorbed and their momentum is transferred to the sail. If laser light with a wavelength of 200 nm is used to propel the sail, how many photons must hit the sail for it to gain 1 kg⋅m/s of momentum? Use a value of 6.63×10 J⋅s for the Planck constant. Give your answer to 3 significant figures.

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