If a potential difference of 20,000 volts is applied across an X-ray t

1.	If a potential difference of 20,000 volts is applied across an X-ray tube, the cut-off wavelength will be (a) 6.21 x 10-10 m (b) 6.21 x 10-11 m (c) 6.21 x 10-12 m (d) 3.1 x 10-11 m
Answer» Correct Answer is: (b) 6.21 x 10^-11 m Photon energy at cut-off wavelength = 20,000 eV. ∴ λ_c = 1242 eV nm/20 X 10³ eV = 6. 21 x 10^-11 m.

If a potential difference of 20,000 volts is applied across an X-ray tube, the cut-off wavelength will be (a) 6.21 x 10-10 m (b) 6.21 x 10-11 m (c) 6.21 x 10-12 m (d) 3.1 x 10-11 m

Answer»

Correct Answer is: (b) 6.21 x 10^-11 m

Photon energy at cut-off wavelength = 20,000 eV.

∴ λ_c = 1242 eV nm/20 X 10³ eV = 6. 21 x 10^-11 m.

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If a potential difference of 20,000 volts is applied across an X-ray tube, the cut-off wavelength will be (a) 6.21 x 10-10 m (b) 6.21 x 10-11 m (c) 6.21 x 10-12 m (d) 3.1 x 10-11 m

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