Question

# The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong?

A
γ rays
B
x rays
C
Infra - red rays
D
Ultraviolet rays

Solution

## The correct option is A x rays$$E=\dfrac{hc}{\lambda}$$or $$\lambda=\dfrac{hc}{E}=\dfrac{(6.6\times 10^{-34})\times (3\times 10^8)}{15\times 10^3\times 1.6\times 10^{-19}}=0.8 \times 10^{-10} m=0.8 {A^o}$$So it is nearly related to the X-ray wavelength.Physics

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