## Quiz 1 Prep Fall 2014 #9 [ENDORSED]

Ronica_Patel_3G
Posts: 10
Joined: Sat Jul 09, 2016 3:00 am

### Quiz 1 Prep Fall 2014 #9

Calculate the de Broglie wavelength of a 0.155 kg ball travelling at 85.0 m.s^-1.

The answer I got was 5.03 * 10^-35 m. On the answers page, they said it was 5 * 10^-35 m. I do not understand how they ended up with one significant figure. I thought there were three so I rounded to three. Can someone explain how they got their answer?

Elias Ruben 1O
Posts: 47
Joined: Wed Sep 21, 2016 2:56 pm

### Re: Quiz 1 Prep Fall 2014 #9  [ENDORSED]

There is no reason why the answer only had one significant figure since the two given values both had three significant figures. I believe your answer is correct and the solution has an error. Don't worry about it.

Arie Hakimi 1L
Posts: 25
Joined: Wed Sep 21, 2016 2:57 pm
Been upvoted: 2 times

### Re: Quiz 1 Prep Fall 2014 #9

From the information you have given us, your answer seems to have to correct amount of sig-figs.