The threshold wavelength for photoelectric from a material is `5200 Å` photoelectric will be emittillumnated with when this meterial is illiuminated with monecharnatic radiation from a
A
`50 `watt infrared lamp
B
`1` - watt infra- red lamp
C
`50 `watt ubraviolet lamp
D
`1` - watt ahraviolet lamp
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The correct Answer is:
C, D
The thereshould wavelength also depands is `5200Å` for ejection of electrons the wavwlength of the liught should be loss thasn `5200Å` as that frequency increases and bance the energy of ncident photo increases ``U V light has less wavelength than `5200Å`
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