HW Question 1.B.15


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605379296
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Joined: Sat Aug 17, 2019 12:16 am

HW Question 1.B.15

Postby 605379296 » Mon Oct 14, 2019 10:28 pm

I got the velocity for this problem which was 3,600,000 m/s but I can't seem to find the mass for this problem. I know you use wavelength= h/mv but how do you get the mass?

Rebecca Epner 4A
Posts: 53
Joined: Sat Aug 17, 2019 12:18 am

Re: HW Question 1.B.15

Postby Rebecca Epner 4A » Mon Oct 14, 2019 10:29 pm

You should use the de Broglie relationship to find the wavelength. lambda=h(mv)^-1

Megan Vu 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:15 am

Re: HW Question 1.B.15

Postby Megan Vu 1J » Tue Oct 15, 2019 11:33 am

For this question, you have the velocity, but the mass will be given as information, so you do not need to do anything else except plug in for mass.

The mass of an electron is always 9.10939 x 10^-28 g, but since we need it to be converted to kg for this equation, you need to divide by 1000 to get 9.10939 x 10^-31 g. Thus, you insert it back to De Broglie's equation as lambda = h/(mv)^-1 because you have all of the variables needed.

Sebastian Lee 1L
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Re: HW Question 1.B.15

Postby Sebastian Lee 1L » Tue Oct 15, 2019 11:34 am

The mass of the electron is a constant that should be given on the constants and equations sheet. The mass of an electron is 9.109 x 10-31 kg. Using the deBroglie equation you can find the wavelength with Planck's constant, velocity, and mass.


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