A violet laser emits a continuous power of at wavelength

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

Problem

A violet laser emits a continuous power of

10\,\text W

at wavelength

400\,\text{nm}

. Estimate the number of photons it emits per second. (a)

2.0\times10^{18}

(b)

2.0\times10^{19}

(c)

5.0\times10^{17}

(d)

2.0\times10^{21}

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