Part A How many photons are emitted during 3.0 s of operation of a red laser poi

Question

Part A How many photons are emitted during 3.0s of operation of a red laser pointer? The device outputs 2.4mW at a 635nm wavelength. How many photons are emitted during 3.0 of operation of a red laser pointer? The device outputs 2.4 at a 635 wavelength. 2.3 Part A How many photons are emitted during 3.0s of operation of a red laser pointer? The device outputs 2.4mW at a 635nm wavelength. How many photons are emitted during 3.0 of operation of a red laser pointer? The device outputs 2.4 at a 635 wavelength. 2.3 How many photons are emitted during 3.0 of operation of a red laser pointer? The device outputs 2.4 at a 635 wavelength. 2.3 How many photons are emitted during 3.0 of operation of a red laser pointer? The device outputs 2.4 at a 635 wavelength. 2.3 How many photons are emitted during 3.0 of operation of a red laser pointer? The device outputs 2.4 at a 635 wavelength. 2.3 2.3

Explanation / Answer

2.4 Watts during 3 seconds means 3 x 2.4 = 7.2 J of energy.

For a photon E = h? = h c / ?

So for a wavelength of 635 nm, each photo carries 2.96 x 10^(-20) J

To get 7.2 J of energy requires

7.2/2.96 x 10^(-20) photons = 2.4324 x 10^20 photons

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