A molecular transition requires of energy

PHYSICS · Single correct · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

A molecular transition requires

5.00\times10^{-18}\,\text{J}

of energy. Which statement correctly compares the number of photons needed if light of

400\,\text{nm}

is used instead of light of

800\,\text{nm}

? (a) Light at 400 nm would require twice as many photons as light at 800 nm. (b) Light at 400 nm would require four times as many photons as light at 800 nm. (c) Light at 800 nm would require twice as many photons as light at 400 nm. (d) Photon energy is independent of wavelength, so both wavelengths require the same number of photons.

Related theory

Electromagnetic Spectrum
Electromagnetic Waves
Photons and particle nature
Dual Nature of Radiation and Matter

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