If φ is the work function of photosensitive material in eV and light… | NEET 2024

Q59NEET 2024Medium

Photoelectric Effect: Einstein's Equation

If $\phi$ is the work function of photosensitive material in $\text{eV}$ and light of wavelength of numerical value $\lambda = \frac{hc}{e}$ metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take $h$ -Plank's constant, $c$ -velocity of light in free space) is (in SI units):

Show answer and solution

Answer: (c)

Photon energy $E = \frac{hc}{\lambda} = \frac{hc}{hc/e} = e$ (in joules, i.e. 1 eV).
Einstein's equation: $K_{max} = E - \phi$
$K_{max} = e - \phi$ (with $\phi$ taken in the same units)
So the answer is (c) $e - \phi$ .

Report a mistake

More questions on Photoelectric Effect: Einstein's Equation

When a certain metallic surface is illuminated with monochromatic light wavelength λ, the…MHT CET 2024 (15 May, Shift 2)
A photoelectric surface is illuminated successively by monochromatic light of Wavelength…MHT CET 2024 (11 May, Shift 2)
A photoelectric surface is illuminated successively by monochromatic light of wavelength…MHT CET 2024 (10 May, Shift 2)
When a photosensitive surface is irradiated by lights of wavelengths ' λ₁ ' and ' λ₂ '…MHT CET 2024 (10 May, Shift 2)
When a metallic surface is illuminated with a radiation of wavelength ' λ ', the stopping…MHT CET 2024 (2 May, Shift 1)
When a metal surface is illuminated by light of wavelength λ, the stopping potential is 8…JEE Main 2024 (31 Jan, Shift 1)
Two identical photocathodes receive light of frequencies ' n₁ ' and ' n₂ '. If the…MHT CET 2024 (9 May, Shift 1)
A photosensitive metallic surface has work function φ. If photon of energy 3φ falls on…MHT CET 2024 (4 May, Shift 2)

Photoelectric Effect: Einstein's Equation question from NEET 2024

More questions on Photoelectric Effect: Einstein's Equation