How many significant figures are in 100.3

What type of electromagnetic radiation has a shorter wavelength than blue light

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?

What physical property of gold makes panning a useful way to get gold from streams?