If you were going to invent a new way to power your mobile phone, which type of electromagnetic wave would be most useful to investigate?

a. radio waves, because they are high energy and common.
b. gamma rays, because they are strong and safe.
c. x–rays, because they are low energy and safe.
d. ultraviolet rays, because they are moderate energy and abundant

Which of the following statements are evidence that gases do not always behave ideally? check all that apply.? a. co2 gas becomes dry ice (solid co2) at 1 atm and –78.5 °c. b. when two gases are mixed, they follow dalton\'s law of partial pressures. c. at 4 k and 1 atm, helium is a liquid. d. it is impossible to compress a gas enough so that it takes up no volume.