Why does squeezing a hose make the water go futher?
According to the continuity equation, A1v1 = A2v2, reducing the area of the opening will cause the velocity to increase.
However, according to Bernoulli's eqn, increase in velocity will cause a decrease in pressure, so that will mean that...
In the derivation of plank's equation on blackbody radiation, the radiation within the cavity must form standing waves and thus each frequency has a certain number of possible modes.
However, I have no idea why the radiation has to form standing waves. Why does the electric field have to be...