When EMR of frequency 5×10¹⁵ hz fall on a metal surface, the maximum kinetic energy of photoelectron is double than the photoelectron which emits when EMR of frequency 3×10¹⁵ hz fall on the Same metal. The threshold frequency for the metal is?

When EMR of frequency 5×10¹⁵ hz fall on a metal surface, the maxim

1.	When EMR of frequency 5×10¹⁵ hz fall on a metal surface, the maximum kinetic energy of photoelectron is double than the photoelectron which emits when EMR of frequency 3×10¹⁵ hz fall on the Same metal. The threshold frequency for the metal is?
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