**Problem:**

The most common wavelength of the red light from a helium-neon laser is 632.1 nanometers. What is the wavelength in meters?

**Solution:**

1 meter = 10

^{9}nanometers

Set up the conversion so the desired unit will be cancelled out. In this case, we want m to be the remaining unit.

distance in m = (distance in nm) x (1 m/10

^{9}nm)

Note: 1/10

^{9}= 10

^{-9}

distance in m = (632.1 x 10

^{-9}) m

distance in m = 6.321 x 10

^{-7}m

**Answer:**

632.1 nanometers is equal to 6.321 x 10

^{-7}meters.