A radioactive source emits X–rays of very short wav...
A radioactive source emits X–rays of very short wavelength (10 -13m ). what is the frequency of these rays?
2 × 1018HZ
3 × 10 19HZ
3 × 1021HZ
3 × 10-19HZ
Correct answer is C
Wavelength(λ)=10−13m
Speed of X-ray = speed of light C=3×108m/s
Frequently (f) = ?
Using V = f\lambda (or (– f π for electromagnetic wave)
f = \frac{c}{\lambda} = 3 \times 10^{8} ÷ 10^{-13} = 3 \times 10^{8} \times 10^{13}
= 3 \times 10^{8} \times 10^{13}
= 3 \times 10^{21}Hz
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