De Broglie Problem

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Doreen Liu 4D
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Joined: Wed Sep 11, 2019 12:17 am

De Broglie Problem

Postby Doreen Liu 4D » Thu Oct 17, 2019 6:24 pm

A baseball must weigh between 5 and 5.25 ounces. What is the wavelength of a 5.15 ounce ball thrown at 92mph.
Can someone help me with this problem? Also, would I have to turn both the ounces and the miles/hour into SI units before I can start solving it?

Posts: 50
Joined: Fri Aug 02, 2019 12:15 am

Re: De Broglie Problem

Postby Mansi_1D » Thu Oct 17, 2019 6:28 pm

To find the wavelength, you would use h/mv equation. The mass is 5.15 ounce and velocity is 92mph. However, the mass has to be in kg and the velocity in m/s when you plug it into the equation, so yes you would have to convert them first.

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Joined: Wed Sep 18, 2019 12:19 am

Re: De Broglie Problem

Postby Ananta3G » Thu Oct 17, 2019 6:38 pm

The equation gives you an answer in meters so you would need to convert the velocity from mph to m/s first. Then, in order for Planck's constant's units, J/Hz to cancel out the other units, you need to convert the mass to Kg, otherwise you would have one mass in ounce but a unit that uses Kg which would stop the equation from working.

Ryan Chang 1C
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Joined: Sat Aug 24, 2019 12:17 am

Re: De Broglie Problem

Postby Ryan Chang 1C » Thu Oct 17, 2019 6:40 pm

After converting the values, plugging in each value would look like this:

(6.626x10^-34 kg ms^2 s^-1)/(1.675x10^-27kg x 100x10^-12m) = 3.96x10^3m/s

Megan Jung 3A
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Joined: Thu Jul 11, 2019 12:17 am

Re: De Broglie Problem

Postby Megan Jung 3A » Thu Oct 17, 2019 7:35 pm

For this problem, you would have to convert oz to kg and mph to km/h

The conversion for oz to kg :

The conversion for mph to km/h:

From there, use De Broglie's Equation to solve for the wavelength

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