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Model Paper 5 — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryModel Paper 51 Mark
MCQ
The formula $E = h \nu$ is used to calculate
  • A
    wave number
  • B
    energy of the ejected electrons
  • C
    radiation emitted by a black body
  • ✓
    energy of quantum
✓

Answer

Correct option: D.
energy of quantum
(d) energy of quantum
Explanation: Max Planck theorized that energy was transferred in chunks known as quanta, equal to $h \nu$. The variable h is a constant equal to $6.63 \times 10^{-34} J \cdot s$ and the variable $\nu$ represents the frequency in $1 / s$.
This equation allows us to calculate the energy of photons, given their frequency.
If the wavelength is given, the energy can be determined by first using the wave equation $(c=\lambda \times \nu)$ to find the frequency, then using Planck's equation to calculate energy.

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