Quiz 1 Prep Fall 2014 #9  [ENDORSED]

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Quiz 1 Prep Fall 2014 #9

Postby Ronica_Patel_3G » Wed Oct 05, 2016 10:09 pm

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

Postby Elias Ruben 1O » Thu Oct 06, 2016 12:10 pm

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
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Re: Quiz 1 Prep Fall 2014 #9

Postby Arie Hakimi 1L » Thu Oct 06, 2016 8:00 pm

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

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