19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The kinetic energy of photoelectrons does NOT depend upon
The minimum frequency ν₀, below which the photoelectric effect is not observed, is called
Ultraviolet light of 6.2 eV falls on an aluminium surface (work function = 4.2 eV). The kinetic energy (in joule) of the fastest electron emitted is approximately:
The threshold wavelength for the photoelectric effect on sodium is 5000 Å. Its work function is:
If the threshold frequency of a metal for the photoelectric effect is ν₀, which of the following will NOT happen?
The energy of an electron in the 3rd orbit of hydrogen atom is
The ionization energy of H atom is 13.6 eV. The ionization energy of Li²⁺ ion will be
Energy of electron of hydrogen atom in the second Bohr orbit is
The Bohr orbit radius for hydrogen atom (n = 1) is 0.529 Å. The radius for the first excited state (n = 2) orbit is
According to Bohr model, angular momentum of an electron in the 3rd orbit is
Electronic energy is negative because
The value of a₀ (Bohr radius) in the expression for the radius of nth orbit of hydrogen atom (rₙ = n²a₀) is