The diagram below shows two rooms that are at different temperatures Room at
50°F
Room at
80°F
Closed door
Which statementbest describes what will happen as the door opens between the two rooms?
A The temperature in both rooms will become equal over time.
B
The temperature in each room will remain unchanged
C
The warmer room will cool down to 50 F.
D
The colder room will warm up to 80F

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?