Single Choice

The energy of a photon is given as $$3.03\times 10^{-19}$$ J/atom. The wavelength of the photon is :

A6.56 nm
B65.6 nm
C0.656 nm
D656 nm
Correct Answer

Solution

Energy of photon, $$E=hc/\lambda$$ or $$\lambda=hc/E$$

Where, $$h=6.626 \times 10^{−34}Js, c=3 \times 10^{8}ms^{-1}$$

Given $$E=3.03 \times 10^{−19}J/atom$$

By putting all these values, we get-

$$\lambda=6.626\times 10^{−34}\times 3\times 10^8 /(3.03\times 10^{−19})$$

$$\lambda= 6.56\times 10^{−7}m= 656 nm$$

So, option $$D$$ is correct.

SIMILAR QUESTIONS

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