When a metal is illuminated by light of ...

When a metal is illuminated by light of wavelength `lambda` , the stopping potential is `V_@` and for wavelength `2lambda`, it is `3V_@`.Then the threshold wavelength is ?

`(2lambda)/3`

`(4lambda)/5`

`(lambda)/5`

`(5lambda)/2`

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JEE MAINS PREVIOUS YEAR-JEE MAIN 2021-PHYSICS SECTION B

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