JEE Physics - MCQ Practice Questions

In Compton scattering, a photon collides with a free electron at rest. Which quantity always increases?

The activity of a radioactive sample decreases from 8000 Bq to 1000 Bq in 20 hours. The half-life of the sample is:

In a nuclear reactor, control rods are used to absorb neutrons. Which isotope is commonly used in control rods?

A radioactive nucleus ₆₀₂₇Co undergoes beta-plus decay. The daughter nucleus is:

The threshold frequency for photoelectric effect in a metal is 6 × 10¹⁴ Hz. The work function of the metal is:

According to the uncertainty principle, if the position of an electron is known with uncertainty Δx = 10⁻¹⁰ m, the minimum uncertainty in momentum is:

The intensity of characteristic X-rays depends on:

A photon of wavelength 100 pm strikes a stationary free electron. After Compton scattering at an angle of 60°, the wavelength of the scattered photon is found to be 102.4 pm. What is the kinetic energy of the recoil electron? (Given: h = 6.63 × 10⁻³⁴ J·s, c = 3 × 10⁸ m/s, mₑ = 9.1 × 10⁻³¹ kg)