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Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased associated to 100 kV then the de-Broglie wavelength associated with the electrons would
Options
(a) increase by 2 times
(b) decrease by 2 times
(c) decrease by 4 times
(d) increase by 4 times
Correct Answer:
decrease by 2 times
Explanation:
λ ∞ 1/√V
λ₁ / λ₂ = √ V₂ / V₁ = √ 1000keV / 25 keV = 2
λ₂ = λ₁ / 2
Related Questions: - A Galilean telescope has an objective of focal length 100 cm and magnifying power 50
- Point masses m₁ and m₂ are placed at the opposite ends of a rigid rod of length L,
- The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function
- A stone falls freely under gravity. It covers distances h1, h2 and h3 in the first 5 secs
- Sound waves travel at 350m/s through a warm air and at 3500 m/s through brass
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A Galilean telescope has an objective of focal length 100 cm and magnifying power 50
- Point masses m₁ and m₂ are placed at the opposite ends of a rigid rod of length L,
- The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function
- A stone falls freely under gravity. It covers distances h1, h2 and h3 in the first 5 secs
- Sound waves travel at 350m/s through a warm air and at 3500 m/s through brass
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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