Physics · 2024
JEE Main · 31 January 2024, Shift 1 · Q46
When a metal surface is illuminated by light of wavelength λ, the stopping potential is 8 V. When the same surface is illuminated by light of…
When a metal surface is illuminated by light of wavelength $\displaystyle \lambda$, the stopping potential is $\displaystyle 8$ V . When the same surface is illuminated by light of wavelength $\displaystyle 3 \lambda$, stopping potential is $\displaystyle 2$ V . The threshold wavelength for this surface is:
Official answer
From NTA’s final answer key for this paper.
(4)
$\displaystyle 9 \lambda$
More from Dual Nature of Matter and Radiation
- In photoelectric effect, the stopping potential (V_0) v / s frequency (ν) curve is plotted. ( h is the Planck's constant and φ_0 is work function of…2025
- An electron is released from rest near an infinite non-conducting sheet of uniform charge density ' -σ '.The rate of change of de-Broglie wave length…2025
- The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these…2025
- In photoelectric experiment energy of 2.48 eV irradiates a photo sensitive material. The stopping potential was measured to be 0.5 V. Work function…2024
- A particle having electric charge 3 × 10^-19 C and mass 6 × 10^-27 kg is accelerated by applying an electric potential of 1.21 V. Wavelength of the…2026
- A convex lens of focal length 40 cm forms an image of an extended source of light on a photoelectric cell. A current I is produced. The lens is…2024
- Which of the following phenomena can not be explained by wave theory of light?2025
- Light source having wavelength 331 nm is used to generate photo-electrons whose stopping potential is 0.2 V. The work function of the used metal in…2026
JEE Main 2024 Physics question, with the answer from NTA’s final answer key. Where our answers come from.