Question

How does the length of an infrared wave compare with the length of a wave of visible light?

A visible light wave is shorter than an infrared wave.

An infrared wave is shorter than visible light.

Some colors of visible light are longer than infrared and some are shorter.

An infrared wave and visible light wave are the same length.

Answer 1

i think its b

Answer 2

hint:
the infrared waves have less energy of the visible light, so we can write this:
\[\Large {\nu _I} < {\nu _V}\]
where \(\nu_I\) is the frequency of the infrared waves, and \(\nu_V\) is the frequency of the visible light
Now, since the product \(\lambda \cdot \nu=c\) is constant, where \(\lambda\) is the wavelength, then we can write:

\[\Large {\lambda _I} > {\lambda _V}\]