A 100 W bulb emits light of wavelength
$x \mathop {\rm{A}}\limits^{\rm{o}} $. What is the value of $x$, if the number of photons emitted is $2.0 \times 10^{20} \mathrm{~s}^{-1}$ ?
$$ \left(h=6.63 \times 10^{-34} \mathrm{Js}, 1 \mathrm{~W}=1 \mathrm{Js}^{-1}\right) $$
The ratio of the difference in energy between the first and second Bohr orbits to that between the second and third orbit is
Assertion (A) First ionisation enthalpy of oxygen is less than that of nitrogen.
Reason (R) Atoms with half-filled or completely filled orbitals are less stable.
The correct option among the following is
In which of the following, molecules are arranged in the increasing order of their bond angles?
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