As light travels from a vacuum (n = 1) to a medium such as glass (n > 1), does its wavelength change?
Does its speed change? Does its frequency change?

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

What is the relationship between the direction of motion of the balloon and the wind currents