## hw problem 1A.7

$c=\lambda v$

Joanna Mendoza 3J
Posts: 20
Joined: Sat Aug 24, 2019 12:17 am

### hw problem 1A.7

Problem: (a) The frequency of violet light is 7.1 x 10^14 Hz. What is the wavelength (in nanometers) of violet light?
The solution manual shows that 2.998 x 10^8 m.s^-1 is divided by the frequency but I don't know where they got the "2.998 x 10^8 m.s^-1" from

305303255
Posts: 40
Joined: Thu Jul 25, 2019 12:16 am

### Re: hw problem 1A.7

The way I did this problem was by using the equation: λ v = c, where v is the frequency and c is a constant for the speed of light. That number that you saw is "c." I hope this helps!

kpang_4H
Posts: 55
Joined: Fri Sep 20, 2019 12:17 am

### Re: hw problem 1A.7

The equation for the speed of light is c = frequency x wavelength. If you remember, c is a constant, 2.998 X 10^8 m/s.

Princess Jereza 3C
Posts: 46
Joined: Sat Jul 20, 2019 12:16 am

### Re: hw problem 1A.7

You probably got confused because the solution manual said 2.998 x 10^8 m.s^-1, but in the textbook it says that the speed of light, c, is 3 x 10^8 m/s