Exercise 1.39  [ENDORSED]

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Jacinda Wollenweber 1D
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Joined: Wed Nov 16, 2016 3:02 am

Exercise 1.39

Postby Jacinda Wollenweber 1D » Sun Jul 09, 2017 11:46 pm

A baseball must weigh between 5.00 and 5.25 ounces (1 ounce = 28.3g). What is the wavelength of a 5.15-ounce baseball thrown at 92mph?
Can someone walk me through the steps please? Thanks!

Stephanie H
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Joined: Fri Jun 23, 2017 11:39 am

Re: Exercise 1.39

Postby Stephanie H » Mon Jul 10, 2017 12:18 am

1) convert 5.15 oz to grams, and 92mph to meters per second

2) once converted, use the De Broglie equation: wavelength=(h)/(mass*velocity)

3) then you will get your answer in meters, convert to nanometers just in case

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Re: Exercise 1.39  [ENDORSED]

Postby CameronJohari1J » Sun Oct 15, 2017 2:40 pm

Quick reminder that once you convert ounces to grams, then grams must then be converted to kg, as SI units must be used to solve debroglie equation problems. The other SI unit in the problem is meters per second for velocity.

Michelle Nwufo 2G
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Joined: Fri May 18, 2018 3:00 am

Re: Exercise 1.39

Postby Michelle Nwufo 2G » Sun Oct 28, 2018 9:13 pm

So, mass is always represented in kilograms and velocity in meters per second?

Bita Ghanei 1F
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Joined: Thu Feb 28, 2019 12:15 am

Re: Exercise 1.39

Postby Bita Ghanei 1F » Fri Oct 25, 2019 9:21 am

Michelle Nwufo 2G wrote:So, mass is always represented in kilograms and velocity in meters per second?

I believe this only holds true for the De Broglie Equation

wavelength in meters,
h in Js,
mass in kg
velocity in m/s

Please correct me if I am wrong.

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