Q18.A monochromatic neon lamp with wavelength of 670. 5 nm illuminates a photo-sensitive material which has a stopping voltage of 0. 48 V . What will be the stopping voltage if the source light is changed with another source of wavelength of 474. 6 nm ? (1) 0. 24 V (2) 1. 5 V (3) 1. 25 V (4) 0. 96 V
What This Question Tests
This problem requires using Einstein's photoelectric equation to determine the work function and then calculate the new stopping voltage for a different wavelength.
Concepts Tested
Formulas Used
E = hν = hc/λ
KE_max = eV_s
KE_max = E - Φ
📚 NCERT Sections This Tests
11.9 — Light Of Wavelength 488 Nm Is Produced By An Argon Laser Which Is
Physics Class 12 · Chapter 11
11.9 Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is made.
11.3 — The Photoelectric Cut-Off Voltage In A Certain Experiment Is 1.5 V.
Physics Class 12 · Chapter 11
11.3 The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted?
11.5 — In An Experiment On Photoelectric Effect, The Slope Of The Cut-Off Voltage
Physics Class 12 · Chapter 11
11.5 In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be 4.12 × 10–15 V s. Calculate the value of Planck’s constant.
📋 Question Details
- Chapter
- Dual Nature of Matter
- Topic
- Photoelectric Effect
- Year
- 2021
- Shift
- 27 Aug Shift 2
- Q Number
- Q18
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 11: Dual Nature of Radiation and Matter
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