Question: Need help with this question for physics. I have attached the screenshot below. Please answer asap. Will give good rating once I get the answer.

Need help with this question for physics. I have attached the screenshot below. Please answer asap. Will give good rating once I get the answer. Thank you

Need help with this question for physics. I have attached the screenshot

When measuring the cut-off wavelength, why does the current go zero when electtrons are still being ejected

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