A photon has momentum of magnitude $8.24 \times 10^{- 28} k g - m / s$ . What is the wavelength of this photon? In what region of the electromagnetic spectrum does it lie?

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$504 n m$ , Infrared Region

$814 n m$ , Infrared Region

$804 n m$ , Ultraviolet Region

$304 n m$ , Ultraviolet Region

answer is B.

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Detailed Solution

$p = \frac{E}{c} \Rightarrow E = p c \Rightarrow λ = \frac{12375}{E (i n e V)} = \frac{12375}{1.54} = 8035 Å \approx 804 n m$
So, this wavelength lies in the infrared region.

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