## 1A.9 problem

$c=\lambda v$

Jazlyn Romero 1I
Posts: 115
Joined: Wed Sep 30, 2020 10:09 pm

### 1A.9 problem

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:

In the third, column, we are given 300 MHz, how would we convert this to Hz to be able to solve for wavelength? Thanks!

Melody Haratian 2J
Posts: 110
Joined: Wed Sep 30, 2020 9:48 pm
Been upvoted: 1 time

### Re: 1A.9 problem

Hi! You can convert MHz to Hz by multiplying MHz by 106. So 300 MHz * 106 would be the amount of MHz in Hz.

kristinalaudis3e
Posts: 86
Joined: Wed Sep 30, 2020 10:11 pm
Been upvoted: 1 time

### Re: 1A.9 problem

To convert 300 MHz to Hz you would multiply it by 10^6. This is because Hz refers to the frequency, in which one cycle goes every second. MHz or Megahertz indicates millions, which is 1 x 10^6. I hope this helps!

Kaiya_PT_1H
Posts: 87
Joined: Wed Sep 30, 2020 10:07 pm

### Re: 1A.9 problem

Does anyone else get an answer of the wavelength being 1 m? In the back of the book it says the answer is 1 nm but I don't see how I'm getting it wrong somehow.

kateraelDis1L
Posts: 104
Joined: Wed Sep 30, 2020 9:54 pm

### Re: 1A.9 problem

I'm getting that too...^^

Silvi_Lybbert_3A
Posts: 97
Joined: Wed Sep 30, 2020 9:43 pm

### Re: 1A.9 problem

Kaiya_PT_1H wrote:Does anyone else get an answer of the wavelength being 1 m? In the back of the book it says the answer is 1 nm but I don't see how I'm getting it wrong somehow.

I also am getting this, and I'm led to believe the book must have made a typo because they do say that the wavelength corresponds to microwaving popcorn and microwaves occur from 1 to 10^-3 m. 1 nm would be x-ray I believe, and the book does not list this activity to correspond with this answer.

Posts: 92
Joined: Wed Sep 30, 2020 9:53 pm
Been upvoted: 1 time

### Re: 1A.9 problem

Going off of that last reply, I have heard of a few typos in the book's answer key. This could be one of them.

Kaiya_PT_1H
Posts: 87
Joined: Wed Sep 30, 2020 10:07 pm

### Re: 1A.9 problem

okay cool, glad it's not just me! I think based on the range for microwaves it would make sense anyway, as Silvi said.