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Modern Physics & Wave Optics
JEE Physics • 10 questions • Free on ExamBattle
Practice Questions
Q1
In Young's double-slit experiment with slit separation d = 0.5 mm and screen distance D = 1 m, the fringe width for light of λ = 500 nm is:
- A. 0.5 mm
- B. 1 mm
- C. 2 mm
- D. 0.25 mm
Q2
The de Broglie wavelength of an electron moving at 10⁶ m/s is approximately (mₑ = 9.1×10⁻³¹ kg, h = 6.63×10⁻³⁴ J·s):
- A. 0.73 nm
- B. 7.3 nm
- C. 0.073 nm
- D. 73 nm
Q3
Which of the following statements about photoelectric effect are CORRECT?
- A. Kinetic energy of photoelectrons depends on the frequency of incident light
- B. Photoelectric current depends on the intensity of incident light
- C. Threshold frequency depends on the material of the emitter
- D. Stopping potential depends on the intensity of incident light
Q4
In Bohr's model of hydrogen atom, which of the following are quantised?
- A. Angular momentum of electron
- B. Energy of the electron
- C. Speed of the electron
- D. Position of the electron
Q5
Which of the following phenomena demonstrate the wave nature of light?
- A. Diffraction
- B. Photoelectric effect
- C. Polarisation
- D. Compton scattering
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