Light rays travel from one medium into another and refract away from the boundary. What changes about the light to cause this refraction? A. Its speed increases.
B. Its frequency increases.
C. Its frequency decreases.
D. Its speed decreases.​

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

Write the correct abbreviation for each metric unit

Akg a of 55 m at an of 11 ? . if is at 98 km/h,be ?