Question

what is the no. of photons with light with a wavelength of 4000m. that provides 1 J of energy ?​

Answer 1

Answer:

The number of photons that will provide 1 J of energy is 4

Explanation:

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Answer 2

Answer:

2.01×10¹⁸

Explanation:

The wavelength of light is 4000pm or 4000×10-¹²m or 4000×10-⁹m

The energy one photon is hc/λ =

$= \frac{6.626 \times 10 {}^{ - 34} \times 3 \times 10 {}^{ 8} }{4 \times 10 {}^{ - 9} } = 4.97 \times 10 {}^{ - 17}$

The number of photons that will provide 1 J of energy is

$\frac{1j}{4.97 \times 10 {}^{ - 17} } j = 2.01 \times 10 {}^{18}$