MHz to Hz 1A.9

Moderators: Chem_Mod, Chem_Admin

Posts: 70
Joined: Wed Sep 30, 2020 9:56 pm

MHz to Hz 1A.9

Postby Anna_Mohling_1D » Wed Oct 21, 2020 2:11 pm

A college student recently had a busy day. Each of the student’s activities on that day (reading, getting a dental x-ray, making popcorn in a microwave oven, and acquiring a suntan) involved radiation from a different part of the electromagnetic spectrum. Complete the following table and match each type of radiation to the appropriate event:

Frequency Wavelength Energy of photon Event

8.7×10^14 Hz

3.3×10^−19 J

300 MHz

2.5 nm

I solved for all the 'blanks' in the box; however, for the wavelength corresponding to 300 MHz, I got 1m instead of 1nm. I multiplied 300MHz by 10^6 to get the frequency in Hz. I think solved for wavelength by doing c/frequency and got the wavelength to equal 1 m. I'm not sure where I messed up my units or how to fix it to get 1 nm.

Pranav Daggubati 3C
Posts: 109
Joined: Wed Sep 30, 2020 9:35 pm

Re: MHz to Hz 1A.9

Postby Pranav Daggubati 3C » Wed Oct 21, 2020 2:15 pm

The answer you got is correct, 300 MegaHertz frequency is equivalent to 1 meter in wavelength. You can see this because 300 MHz is the same as 3 x 10^8 Hz, which when multiplied by 1 equals the speed of light.

Posts: 19542
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 882 times

Re: MHz to Hz 1A.9

Postby Chem_Mod » Wed Oct 21, 2020 2:16 pm

Hi Anna, your calculations are correct. The answer key in the back of the textbook has an error; however, you should be referring to the Student Solutions Manual to check your work; the answer is correct in the SSM.

Posts: 51
Joined: Wed Sep 30, 2020 9:47 pm

Re: MHz to Hz 1A.9

Postby Daniela_Martinez_3B » Fri Oct 23, 2020 10:42 pm

The same thing happened to me! In case you couldn't find it, here's the link to the solution's manual with other errors from the textbook

Return to “Properties of Light”

Who is online

Users browsing this forum: No registered users and 2 guests