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Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube. The cut-off wavelength (λ₀) of the emitted X-ray is
Options
(a) λ₀= 2mcλ²/h
(b) λ₀= 2h/mc
(c) λ₀= 2m²c²λ³/h²
(d) λ₀= λ
Correct Answer:
λ₀= 2mcλ²/h
Explanation:
λ = h / p ⇒ p = h / λ
KE of electrons = E = p² / 2m = h² / 2mλ²
Also in X-ray, λ₀ = hc / E = 2mcλ² / h
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If the cold junction of a thermo-couple is kept at 0⁰C and the hot junction is kept
- An air core solenoid has 1000 turns and is one meter long. Its cross sectional area
- An electric dipole is placed at an angle 30°with an electric field intensity 2×10⁵N/C.
- Element ²³⁴U has 92 protons and 234 nucleons in its nucleus. It decays by
- A battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
Topics: Atoms and Nuclei (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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