Parameters of blue and red light are 400 nm and 750 nm respectively. Which of the two is of higher energy?

Monjur Alahi

Parameters of blue and red light are 400 nm and 750 nm respectively. Which of the two is of higher energy?


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Salim Ahmed Kawsar

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400 nm and 750 nm are the wavelengths of blue and red light respectively. Energy of radiation is given by the expression E = hν and the frequency (ν), of radiation is related to the wavelength by the expression.

ν = \(\frac{c}{\lambda}\) 

∴ E = \(\frac{hc}{\lambda}\) 

Therefore,

Shorter the wavelength, λ, larger the frequency, ν, and higher the energy, E. 

Thus,

Blue light which has shorter λ (400 nm) than red light (750 nm) has higher energy.

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