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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
A surface ejects electrons when hitted by green light but not. When hitted by yellow light. Will electrons be ejected if the surface is hitted by red light :
  • A
    Yes
  • ✓
    No
  • C
    Yes, if the red beam is quite intense
  • D
    Yes, if the red beam continues to fall upon the surface for a long time
✓

Answer

Correct option: B.
No
b
Energy of red light $<$ Energy of yellow light

$\therefore$ Energy of yellow light is less then threshold energy, it implied energy of red light is less then threshold energy.

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