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I vs V - Varying Frequency

A surface eje...

Question

A surface ejects electrons when hit by green light but not when hit by yellow light. Will electrons be ejected if the surface is hit by red light?

A

Yes

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B

No

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C

Yes, if the red bream is quite intense

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D

Yes, if the red beam continues to fall upon

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Solution

The correct option is B No
Energy of red light < Energy of yellow light
$∴$ Energy of yellow light is less then threshold energy, it implied energy of red light is less then threshold energy.

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