Class 12 Physics
Dual Nature Of Radiation and Matter
Very Short Questions Answers
Answer: Kinetic Energy (K) = p²/2m
where p = momentum and m = mass.
∴ p = √2mK
∴ de-Broglie wavelength λ = h/p = h/ √2mK
Q2: Mention one physical process for the release of an electron from the surface of a metal?
Answer: Photoelectric emission.
Q3: Name an experiment which shows the wave nature of the electron. Which phenomenon was observed in this experiment using an electron beam?
Answer: Davisson-German experiment shows the wave nature of the electron. Phenomena of constructive interference were observed in the Davisson-Germer experiment.
Q4: What is Thermionic emission?
Answer: It is the phenomenon of emission of electrons from the metal surface when heated suitably.