Physics Question: On Velocity-Wavelength- Frequency (1 Viewer)

[theonly1]

hey,

recently i got a question from my teacher below and we seem to be coming to two different answers. Hopefully you may be able to shed some light on the issue. The question is

1) The velocity of red light with wavelength of 550nm and a period of 5.0 is?

My Working:

Since i need to find the velocity and i have the wavelength and can find the frequency i would use the formula V= f λ

Period = 5.0 so to convert this to frequency is 1/t so
frequency= 1/5

Now need to convert 550nm into m: (550nm = 5.5 × 10^7m)

Now need to apply the formula: V=f λ

V= (5.5 x 10^7) x (1/5)
= 0.00000011
= 1.1 x 10^-7

Did i do anything wrong? my teacher believes the answer to be 110m/s

 

[braintic]

Posted in the wrong section.

 

[ddmoore95]

Isn't it just 3x10^8 m/s

 

[AnimeX]

Isn't it just 3x10^8 m/s

Might not be in the air medium

Your answer seems correct OP. But it doesn't really make sense that the frequency is that low.
Frequency of light is typically in the x10^15 area.