Heat transfer from hot or cold liquids in a thermos bottle is prevented by ______________.
a. convection
b. conduction
c. radiation
d. all of these
Question 2
A proton and an antiproton each with total energy of 400 GeV collide head-on. What is the total energy (particles + energy) released?
a. zero
b. 400 Gev
c. 800 GeV
d. 1 600 GeV
e. 2 400 GeV