When rubidium ions are heated to a high temperature, two lines are observed in its line spectrum at wavelengths (a) 7.9 × 10−7 m and (b) 4.2 × 10−7 m. what are the frequencies of the two lines? what color do we see when we heat a rubidium compound?

The frequencies of the two lines are:

a)

b)

When we heat rubidium compound we will see red color.

Explanation:

c = speed of light

= wavelength of light

a) Frequency of the light when wavelength is equal to

This frequency corresponds to red light

b) Frequency of the light when wavelength is equal to

This frequency corresponds to violet light

When we heat rubidium compound we will see red color.

that tool would be a compass