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The threshold frequency for photoelectric effecton sodium corresponds to a wavelength of5000 Å. Its work function is [1988]
  • a)
    4 × 10–19 J
  • b)
    1 J
  • c)
    2 × 10–19 J
  • d)
    3 × 10–19 J
Correct answer is option 'A'. Can you explain this answer?
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The threshold frequency for photoelectric effecton sodium corresponds ...
Angstroms.

This is because the threshold frequency (f) and the corresponding wavelength (λ) are related by the equation:

f = c/λ

where c is the speed of light in vacuum. For sodium, the threshold frequency is typically around 5.0 x 10^14 Hz. Plugging this into the equation above, we get:

5.0 x 10^14 Hz = (3.0 x 10^8 m/s) / λ

Solving for λ, we get:

λ = (3.0 x 10^8 m/s) / 5.0 x 10^14 Hz

λ ≈ 6.0 x 10^-7 m = 6000 angstroms

Therefore, the threshold frequency for photoelectric effect on sodium corresponds to a wavelength of 6000 angstroms.
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