## Hmwk Problem 1.9 [ENDORSED]

$c=\lambda v$

Nasir_Ahmed
Posts: 25
Joined: Wed Sep 21, 2016 2:58 pm

### Hmwk Problem 1.9

I was wondering if anyone could help me with problem 1.9 in the textbook. I'm not sure exactly how I'm supposed to deduce everything in the table from the information given. It doesn't seem like enough to go off of. Thanks

Daniel-1G
Posts: 14
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Hmwk Problem 1.9  [ENDORSED]

Try using a combination of E=h*frequency and c=frequency*wavelength. Using these equations you should be able to fill out the table.

Olivia_Chen_3E
Posts: 18
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Hmwk Problem 1.9

Also, if you look up a chart with the different wavelengths of light, it will help you figure out what activity the college student is doing, for example, when the wavelength is 340nm, that's in the UV range, so we can assume that he's getting a sun tan.

Emma Dawson 1H
Posts: 4
Joined: Wed Sep 21, 2016 3:00 pm

### Re: Hmwk Problem 1.9

Going off of looking at the chart to figure out what wavelengths apply to which light on the spectrum...should we memorize those for future quizzes and tests or will a similar chart be given?

Emma Dawson 1H
Posts: 4
Joined: Wed Sep 21, 2016 3:00 pm

### Re: Hmwk Problem 1.9

Going off of looking at the chart to figure out what wavelengths apply to which light on the spectrum...should we memorize those for future quizzes and tests or will a similar chart be given?

Claire_Zhou_1A
Posts: 48
Joined: Wed Sep 21, 2016 2:58 pm
Been upvoted: 1 time

### Re: Hmwk Problem 1.9

I'm still confused. How to differentiate between reading and suntan?

Claire_Zhou_1A
Posts: 48
Joined: Wed Sep 21, 2016 2:58 pm
Been upvoted: 1 time

### Re: Hmwk Problem 1.9

Never mind. I know now.