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I am currently taking my first Quantum Mechanics course and was given this problem in a practice set(we are supposed to refer to old intro textbooks). We haven't covered the photoelectric effect (just theory) much in class and reading through other textbooks, I wasn't able to find any similar questions. Any hints on how to approach this question would be greatly appreciated. Thank you.

KE = hf - phi

I know phi, so KE = hf - 2.3eV

However, I do not know how to find f since I don't know wave length.

I also do not understand how I can relate it back to time.

1. Homework Statement

https://i.imgur.com/1FT6skF.jpg1. Homework Statement

https://i.imgur.com/1FT6skF.jpg

## Homework Equations

KE = hf - phi

## The Attempt at a Solution

I know phi, so KE = hf - 2.3eV

However, I do not know how to find f since I don't know wave length.

I also do not understand how I can relate it back to time.

#### Attachments

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