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MHT CET Physics Model Test 03 — MHT - CET STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceMHT - CETMHT CET Physics Model Test 031 Mark
MCQ
A metal surface having work function $'w_0$' emits photoelectrons when photons of energy 'E' are incident on it. The electron enters the uniform magnetic field (B) in perpendicular direction and moves in circular path of radius 'r'. Then 'r' is equal to (m and e be the mass and charge of electron respectively) ____________.
  • ✓
    `sqrt(2"m" ("E" - "w"_0))/"eB"`
  • B
    `("m" ("E" - "w"_0))/"eB"`
  • C
    `sqrt("m" ("E" - "w"_0))/"eB"`
  • D
    `(2"m" ("E" - "w"_0))/"eB"`
✓

Answer

Correct option: A.
`sqrt(2"m" ("E" - "w"_0))/"eB"`
A

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