When one of the electrons of a particular atom undergoes a transition to a quantum state of lower energy, it: a. collides with another of its electrons
b. exchanges quantum states with another of its electrons
c. undergoes a transition to a quantum state of higher energy
d. emits a photon of light

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?