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MHT CET Physics Model Test 05 — MHT - CET STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceMHT - CETMHT CET Physics Model Test 051 Mark
MCQ
Light of wavelength `lambda` strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to `lambda'` where ____________.
  • ✓
    `lambda/2 < lambda' < lambda`
  • B
    `lambda' > lambda`
  • C
    `lambda' = lambda/2`
  • D
    `lambda' = 2lambda`
✓

Answer

Correct option: A.
`lambda/2 < lambda' < lambda`
A

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