## Speed of light constant

$c=\lambda v$

paulacamara1E
Posts: 30
Joined: Fri Apr 06, 2018 11:05 am

### Speed of light constant

When reviewing the properties of light Dr. Lavelle gave as the constant c as 3.00 x 10ˆ8 m/s. I understand that this constant will always be given and that it is part of a formula but I was quite confused as to which type of problem/when would we use this constant?

404975170
Posts: 68
Joined: Thu Jul 27, 2017 3:00 am

### Re: Speed of light constant

this is the speed of light in a vacuum so this constant is wavelength x frequency

Chem_Mod
Posts: 18880
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 714 times

### Re: Speed of light constant

You will see this constant in the wave equations f=c/λ which relates wavelength and frequency. If given frequency of an electromagnetic wave and asked to find the wavelength, then you would use the speed of light constant.

Taizha 1C
Posts: 36
Joined: Fri Apr 06, 2018 11:01 am

### Re: Speed of light constant

Do we need to memorize the speed of light in different conditions for the exam?

Jennifer Ma 1G
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

### Re: Speed of light constant

Taizha 1C wrote:Do we need to memorize the speed of light in different conditions for the exam?

I believe that such constants will be given to us on the exam.

Komal Prakash 1H
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am
Been upvoted: 1 time

### Re: Speed of light constant

The speed of light constant, c, will be provided to us as previously mentioned and can be used in a variety of problems. We recently have also begun to conduct calculations using E= h x v as well as En= (-h x R)/(n^2). These questions often give us energy levels that electrons transition from and require us to find wavelength. Since the equation c=wavelength x frequency is needed for wavelength, we would need to use c in these types of problems as well.