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NDA 2 2025 GAT, question 60

Topic: Physics

Q60

The energy, EE, of a photon can be expressed as E=hfE=hf where ff is the frequency and hh is Planck’s constant. The dimensions of hh are the same as that of

  1. (a) linear momentum
  2. (b) angular momentumCorrect answer
  3. (c) displacement
  4. (d) torque

Solution.

Answer: (b) angular momentum

  1. From h=E/f, its dimensions are [ML²T⁻²]/[T⁻¹]=[ML²T⁻¹].
  2. Angular momentum r×p has those same dimensions.
  3. Torque has dimensions of energy, not energy multiplied by time.