19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The ionization energy of H atom is 13.6 eV. The ionization energy of Li²⁺ ion will be
If the threshold frequency of a metal for the photoelectric effect is ν₀, which of the following will NOT happen?
The threshold wavelength for the photoelectric effect on sodium is 5000 Å. Its work function is:
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 energy required to break one mole of Cl–Cl bonds in Cl₂ is 242 kJ mol⁻¹. The largest wavelength of light capable of breaking a single Cl–Cl bond is
The number of photons emitted in 10 hours by a 60 W sodium lamp (λ = 6000 Å) is approximately
The number of photons of light with wave number ν̄ = 2.5 × 10⁶ m⁻¹ necessary to provide 1 J of energy are
Which is NOT a characteristic of Planck's quantum theory of radiation?
Calculate the frequency of yellow radiation having wavelength 5800 Å.
Rutherford's nuclear model of the atom failed to explain
In the Rutherford scattering experiment, most α-particles passed straight through the gold foil because
The electrical discharge through gases could be observed only at
The e/m ratio for anode rays (positive rays) in comparison to cathode rays is: