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Physics · 2022 · 2 marks
Dual Nature of Radiation and MatterEinstein’s Photoelectric Equation: Energy Quantum of Radiation2 marksUnderstandvery short answer
CBSE 2022 · Region 5 · Set 1 · Q2
(a) What results do you expect if α -particle scattering experiment is repeated using a thin sheet of hydrogen in place of a gold foil? Explain.…
(a)
What results do you expect if $\displaystyle \alpha$-particle scattering experiment is repeated using a thin sheet of hydrogen in place of a gold foil ? Explain. (Hydrogen is a solid at temperature below 14K)
OR
(b)
Why it is the frequency and not the intensity of light source that determines whether emission of photoelectrons will occur or not ? Explain.
Marking-scheme solution
There would be no large angle scattering / Size of nucleus can't be determined. As hydrogen atom which is a target nucleus has only one proton whereas approaching $\displaystyle \alpha$ particle is more massive than the target nucleus.
Alternatively: Repulsive force between target nucleus (Hydrogen) and $\displaystyle \alpha$ particles will be very less.
According to the photon picture of light the emission of photoelectrons depend on the energy of photon incident on the metal surface which is determined by the frequency not by the intensity.
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