» CBSE Physics Electrons and Photons Expected Questions : Unit IX

CBSE Physics Electrons and Photons Expected Questions : Unit IX

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[Short/Very Short Questions-1-2 Marks)

1. Intensity of incident radiation on a metal is doubled, what happens to kinetic energy of electrons
emitted ?
Answer

2. Calculate de Broglie wavelength of a body of mass 3 kg moving at 5 ms^-1
Answer

3. What is the main features of a metal used for photoelectric emission ?
Answer

4. Why de-Broglie wavelength of a mass on the earth is not noticeable ?
Answer

5. The de-Broglie wavelength of a photon and an electron are the same. Which of the two has greater energy ?
Answer

6. What happens to the velocity of the emitted photoelectrons if the wavelength of the light incident is decreased ?
Answer

7. What is dimension and SI unit of Planck’s constant ?
Answer

8. What is meant by Stopping potential ? How is it related to intensity of light ?
Answer

9. What is the value of Stopping potential betweeen the cathode and the anode of a photocell, if maximum kinetic energy of an electron is 5eV ?
Answer

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