Ionisation potential of hydrogen atom is 13.6 V. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. The spectral lines emitted by hydrogen atoms according to Bohr's theory will be
one
two
four
three
D.
three
Energy in the excited state = 13.6 + 12.1
= 1.5 eV
∴ = 1.5
n =
n = 3
∴ Number of spectral lines
=
=
= 3
A proton and an electron travelling along parallel paths enter a region of uniform magnetic field, acting perpendicular to their paths. Which of them will move in a circular path with higher frequency ?
Draw graphs showing a variation of the photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity.
Four nuclei of an element undergo fusion to form a heavier nucleus, with the release of energy. Which of the two — the parent or the daughter nucleus — would have higher binding energy per nucleon?
Which of the following transitions in hydrogen atoms emit photons of highest frequency?
The energy spectrum of β-particles [number N(E) as a function of β-energy E] emitted from a radioactive source is
Mock Test Series
