JEE Physics - MCQ Practice Questions

A photon of energy 13.6 eV is incident on a hydrogen atom in ground state. What is the maximum kinetic energy of the ejected electron?

In the Bohr model, which of the following represents the radius of the nth orbit in a hydrogen atom?

A hydrogen atom transitions from n=4 to n=2 state. The wavelength of emitted photon is approximately:

The binding energy per nucleon for ⁵⁶Fe is maximum among all nuclei. This suggests that:

In beta decay, a neutron converts to a proton. Which particle is emitted?

A radioactive element has 75% of its original mass remaining after 6 hours. What is its half-life?

Which of the following statements about alpha particles is correct?

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

In photoelectric effect, the stopping potential is 2V. The maximum kinetic energy of ejected electron is:

A nucleus undergoes alpha decay. The mass number and atomic number of the daughter nucleus are:

The work function of a metal is 3 eV. What is the threshold frequency for photoelectric emission?

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

The activity of a radioactive sample is defined as:

An electron in excited state of hydrogen atom has angular momentum 2ℏ. The principal quantum number n is:

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

The ratio of de Broglie wavelengths of an electron and a proton having same kinetic energy is:

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

A nucleus ²³⁸₉₂U undergoes two alpha decays and two beta decays. The final nucleus is:

The energy released in nuclear fusion of two deuterium nuclei to form ⁴He is approximately:

In Compton effect, the wavelength shift depends on: