First slide

Electromagnetic spectrum

Question

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

Moderate

A

$γ$ - rays
B

X - rays
C

Infrared rays
D

Ultraviolet rays

Solution

Wavelength E.M wave
$λ = \frac{12400}{E (eV)} (\overset{0}{A}); λ = \frac{12400}{15 x 10^{3}} (\overset{0}{A})$
$λ = 0.826 (\overset{0}{A})$ ;
This is x–ray’s wavelength

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