The wavelength of a wave doubles as it travels
from medium a into medium b. compared to the
wave in medium a, the wave in medium b has
(1) half the speed
(2) twice the speed
(3) half the frequency
(4) twice the frequency

How would you place two electrons on a sphere of radius r so that the electrostatic potential energy is minimized. how would you place three electrons to solve the same problem.

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.