CBSE 2022 · Region 5 · Set 1 · Q2 · 2 marks
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)Why it is the frequency and not the intensity of light source that determines whether emission of photoelectrons will occur or not ? Explain.
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)
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.
Dual Nature of Radiation and MatterEinstein’s Photoelectric Equation: Energy Quantum of RadiationUnderstandvery_short_answermedium
More from Dual Nature of Radiation and Matter
- Consider a neutron (mass m ) of kinetic energy E and a photon of the same energy. Let λ n and λ p be the de…2024 · asked 3×
- Assertion: Photoelectric current increases with an increase in intensity of incident radiation, for a given…2024 · asked 3×
- Figure shows the variation of photoelectric current measured in a photo cell circuit as a function of the…2023 · asked 3×
- Atomic spectral emission lines of hydrogen atom are incident on a zinc surface. The lines which can emit…2025 · asked 3×
- A beam of red light and a beam of blue light have equal intensities. Which of the following statements is…2025 · asked 3×
- Assertion: If accelerated electrons are passed through a narrow slit, a diffraction pattern is observed.…2026 · asked 3×
- Assertion: In photoelectric effect, the kinetic energy of the emitted photoelectrons increases with increase…2024 · asked 3×
- The figure shows v m^2 versus 1/(λ) graph for photoelectrons emitted from a surface where v m is the maximum…2023 · asked 3×
CBSE Class 12 Physics past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.