JEE Physics - MCQ Practice Questions

The de Broglie wavelength of an electron accelerated through a potential difference of 100 V is approximately:

In a hydrogen atom, the ground state energy is -13.6 eV. What is the energy required to ionize from n=3?

When a moving electron is stopped completely in matter, the kinetic energy is converted to:

In X-ray production, the minimum wavelength of continuous X-ray spectrum depends on:

In Compton effect, the wavelength shift depends on:

The de Broglie wavelength of a neutron at room temperature (T = 300 K) is approximately:

An electron transitions from n=3 to n=1 in hydrogen atom. The frequency of emitted photon is (R = 1.097×10⁷ m⁻¹):

The nuclear radius of a nucleus with mass number A is given by R = R₀A^($\frac{1}{3}$), where R₀ ≈ 1.2 fm. For ⁸⁸₃₈Sr, the nuclear radius is approximately:

The decay constant λ of a radioactive substance and its half-life t₁/₂ are related by:

An electron and a proton have the same kinetic energy. The ratio of their de Broglie wavelengths is:

In nuclear fission of ²³⁵U, approximately 200 MeV energy is released. The mass defect in this reaction is approximately:

A nucleus ⁹⁴₃₈Sr undergoes beta-minus decay followed by another beta-minus decay. The final nucleus is:

A photon of frequency 6 × 10¹⁵ Hz is incident on a metal surface with work function 2 eV. What is the maximum kinetic energy of the ejected photoelectron? (h = 4.14 × 10⁻¹⁵ eV·s)

An electron in the first excited state of hydrogen atom (n=2) transitions to ground state (n=1). The wavelength of emitted photon is approximately:

The de Broglie wavelength of an electron with kinetic energy 50 eV is:

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: