A He–Ne laser emits light at a wavelength of

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

A

5.0\,\text{mW}

He–Ne laser emits light at a wavelength of

633\,\text{nm}

. Approximately how many photons does the laser emit each second? (a)

1.0\times10^{17}

(b)

3.2\times10^{15}

(c)

1.6\times10^{16}

(d)

1.6\times10^{19}

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