AAMC Physics Qbank#65

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cr1123
Posts: 5
Joined: Tue Jul 30, 2019 11:06 am

AAMC Physics Qbank#65

Post by cr1123 » Wed Aug 07, 2019 4:05 pm

(3.0 × 10^8 m/s)/( 10^15 Hz) = 3.0 × 10–7 m

How do the seconds cancel out here? I know Hz is 1/s. So its (m/s)/(1/s).
When working this problem I originally multiplied (3.0 × 10^8 m/s) by ( 10^15 Hz) to get 3x10^23
NS_Tutor_Mathias
Posts: 280
Joined: Sat Mar 30, 2019 8:39 pm

Re: AAMC Physics Qbank#65

Post by NS_Tutor_Mathias » Wed Aug 07, 2019 5:50 pm

Right, you wanted to divide those two quantities because lambda = c/f

Dividing by 1/s is the same as multiplying by s. Or for the entire term, dividing by 10^15 1/s is the same as multiplying by 10^-15 s.

I've attached a quick image that might help a little. But essentially you are on the right track, just don't forgot to flip the whole term when multiplying by a reciprocal, not just the units.
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