Final answer:
9.91 x 10 meters is converted to nanometers by multiplying by 10^9, giving a result of 9.91 x 10^9 nanometers.
Step-by-step explanation:
To convert 9.91 x 10 meters to the equivalent length in nanometers, we use the conversion factor that 1 meter is equivalent to 109 nanometers. With this conversion factor, we can set up the conversion as follows:
9.91 x 10 meters x (109 nanometers / 1 meter) = 9.91 x 109 nanometers.
Therefore, 9.91 x 10 meters is equal to 9.91 x 109 nanometers.