Physics · 2019
JEE Main · 11 January 2019, Shift 2 · Q25
In a photoelectric experiment, the wavelength of the light incident on a metal is changed from 300 nm to 400 nm. The decrease in the stopping…
In a photoelectric experiment, the wavelength of the light incident on a metal is changed from $\displaystyle 300$ nm to $\displaystyle 400$ nm. The decrease in the stopping potential is close
$$\text { to : }\left(\frac{\mathrm{hc}}{\mathrm{e}}=1240 \mathrm{~nm}-\mathrm{V}\right)
$$
Official answer
(1)
$\displaystyle 1.0 \mathrm{~V}$
More from Dual Nature of Matter and Radiation
- The electric field at a point associated with a light wave is given by E=200[ sin (6 × 10^15) t+ sin (9 × 10^15) t] Vm^-1 Given: h=4.14 × 10^-15 eVs…2022
- 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
- The work functions of Aluminium and Gold are 4.1 eV and and 5.1 eV respectively. The ratio of the slope of the stopping potential versus frequency…2023
- 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
- The speed of electrons in a scanning electron microscope is 1 × 10^7 ms^-1. If the protons having the same speed are used instead of electrons, then…2021
- 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
JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.