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Infrared radiation?

A light source emits infrared radiation at a wavelength of 1150 nm. What is the frequency of the radiation?

I would have used $v=f\lambda$ but there are no velocity given...

Quote:

Originally Posted by Unknown008

I would have used $v=f\lambda$ but there are no velocity given...

Are you sure? Think about it.

If i understood, $v = c$ , that is 300000000m/s? Ok, then $f=\frac{300000000}{1150\times{10}^{-9}} = 2.61\times{10^{14}}$ ? Nano is 10^-9?

Quote:

Originally Posted by Unknown008

If i understood, $v = c$ , that is 300000000m/s? Ok, then $f=\frac{300000000}{1150\times{10}^{-9}} = 2.61\times{10^{14}}$ ? Nano is 10^-9?

yup :)

Ok, thanks for the hint. I hope I'll not make those silly mistakes later on...

Infrared radiations are of short wavelengths and travel at almost at the speed of light,i.e, 300000000 km per second

Hmm, sorry, Programmer, the speed of light is about 300000000 m/s or 300000km/s.

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