Which of these are unit rates
a square yard for every 100 grass seeds
4 acres for 800 plants
2 plants in a square foot
6 plants in 1 square yard
8 seeds per square foot
25 trees per 25 square yards

Apossible wavelength for the color blue is 0.000000492 meter. which of the following is a reasonable estimate for this wavelength for the color blue? a. 5 × 10-6 m b. 5 × 107 m c. 5 × 10-7 m d. 5 × 106 m