Question

How long are infrared waves compared with waves of visible light?

Answer 1

Infra red ranges from the upper end of the wavelength of visible light up to `1400` times that.

Explanation:

The wavelength of visible light ranges from `400`nm up to `700`nm.

The wavelength of infra red ranges from `700`nm (`7xx10^-7`m) all of the way up to `1`mm (`1xx10^-3`m).

So the range of visible light is about one octave while that of infra red is over ten octaves.