## Self Test 1B.4B

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

ShravanPatel2B
Posts: 100
Joined: Fri Aug 30, 2019 12:18 am

### Self Test 1B.4B

I was reading through the textbook and found one of the example questions under the de Broglie section and i am not sure if the answer I got is correct.

The Question:

Self-test 1B.4B Calculate the wavelength of a rifle bullet of mass 5.0 g traveling at twice the speed of sound (the speed of
sound is 331 m?s21).

For my answer I i used de Broglies equation which is wavelength = plancks constant/momentum

I ended up with 2.0 * 10^-34 m

Did anyone else try to do this problem and if so did you get the same answer?

Christine Honda 2I
Posts: 116
Joined: Sat Sep 14, 2019 12:17 am

### Re: Self Test 1B.4B

Using De Broglie's equation I plugged in the numbers:

(6.62 x 10^-34)/[(0.005)(686) = 1.93 x 10^-34 m