Light rays travel from one medium into another and refract away from the boundary. What changes about the light to cause this refraction?
a. it’s speed increases
b. it’s speed decreases
c. it’s frequency decreases
d. it’s frequency increases

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

Asolution contains 180 g of glucose (c6h12o6) and 162 g of water. what is the mole fraction of glucose?