Which two of the following actions would result in a guitar string sounding a lower note
when plucked?
A Loosening the string
B Tightening the string
C Shortening the string
D Using a heavier string

What type of light does this light bulb produce most (i.e. at what wavelength does the spectrum have maximum intensity)?

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.

Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.