## 1B.15 a

$\lambda=\frac{h}{p}$

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Ayush Ray 1I
Posts: 53
Joined: Sat Sep 14, 2019 12:15 am

### 1B.15 a

The velocity of an electron that is emitted from a
metallic surface by a photon is 3.63 x 10^3 km/s
(a) What is the wavelength of the ejected electron?

I'm confused because the solution manual says to use de Broglie's equation. However, there is no mass given in the question.

Andrew Jang 4D
Posts: 50
Joined: Sat Aug 17, 2019 12:18 am

### Re: 1B.15 a

The mass of an electron is given in the back of the textbook in the "fundamental constants" section. I think we're expected to use that in any problems that involve electron mass in some way.

Ayush Ray 1I
Posts: 53
Joined: Sat Sep 14, 2019 12:15 am

### Re: 1B.15 a

Oh, alright. Thank you so much.

CynthiaLy4F
Posts: 103
Joined: Sat Jul 20, 2019 12:16 am

### Re: 1B.15 a

The mass would be that of an electron which is 9.1095*10^-31 kg.

Bradley Whitworth 4B
Posts: 54
Joined: Sat Jul 20, 2019 12:17 am

### Re: 1B.15 a

The mass of an electron is something that is a given usually on the formula sheet with all the other constants and given equations so you should be ok.

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