Modern Physics 1 Question 57
53. Ultraviolet light of wavelengths and when allowed to fall on hydrogen atoms in their ground state is found to liberate electrons with kinetic energy and respectively. Find the value of Planck’s constant.
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Solution:
- When
wavelength falls on hydrogen atom (in ground state) energy is used in liberating the electron. The rest goes to kinetic energy of electron.
Hence,
Similarly, for the second wavelength :
Solving these two equations, we get