When light a 470Nm falls on surface of k metal electron are emite if velocity 6.4*10 power4m/sec what is the minimum energy requied to remove 1 mole of electron from metal surface k metal.

When light a 470Nm falls on surface of k metal electron are emite if v

1.	When light a 470Nm falls on surface of k metal electron are emite if velocity 6.4*10 power4m/sec what is the minimum energy requied to remove 1 mole of electron from metal surface k metal.
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