A radioactive source emits X rays of very short... - JAMB Physics 2015 Question
A radioactive source emits X–rays of very short wavelength (10 -13m ) what is the frequently of these rays?
A
2 × 1018HZ
B
3 × 10 19HZ
C
3 × 1021HZ
D
3 × 10-19HZ
correct option: c
Wavelength (Λ) = 10 -13m
Speed of X-ray = speed of light C = 3×103m/s
Frequently (f) = ?
Using V = fΛ (or (– f π for electromagnetic wave)
f = c/Λ = 3 × 108 ÷ 10-13 = 3 × 103 × 103
= 3 × 1013 × 1013
= 3 × 1021HZ
Speed of X-ray = speed of light C = 3×103m/s
Frequently (f) = ?
Using V = fΛ (or (– f π for electromagnetic wave)
f = c/Λ = 3 × 108 ÷ 10-13 = 3 × 103 × 103
= 3 × 1013 × 1013
= 3 × 1021HZ
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