The students observe that the pitches of the sounds from the fire truck and the
ambulance siren are different. The siren for each vehicle has a different pitch, as shown
in Figure 2. The ambulance siren has sound waves with a higher pitch than sound
waves from the fire truck siren
Figure 2. Pitches of Emergency Sirens
10m m high-pitched sound
ambulance
--
m
l
ow. pitched sound
fire truck
Based on Figure 2, which statement best describes how the pitch and the
frequency of sound waves are related?
A. Sound waves with a higher frequency have a higher pitch.
B. Sound waves with a lower frequency have a higher pitch.
C. Sound waves with a higher frequency have a lower pitch.
D. Sound waves with higher and lower frequencies can have the same pitch

What happens during the fall in september

Conventional hot-water heaters consist of a tank of water maintained at a fixed temperature. the hot water is to be used when needed. the drawback is that energy is wasted because the tank loses heat when it is not in use, and you can run out of hot water if you use too much. some utility companies are encouraging the use of on-demand water heaters (also known as flash heaters), which consist of heating units to heat the water as you use it. no water tank is involved, so no heat is wasted. a typical household shower flow rate is 2.50 gal/min (9.46 l/min ) with the tap water being heated from 51.0 ˚f (10.6 ˚c) to 120 ˚f (48.9 ˚c) by the on-demand heater.what rate of heat input (either electrical of from gas) is required to operate such a unit, assuming that all the heat goes into the water?

Which term defines a powers shared by state and federal governments? a. concurrent. b. expressed. c. implied. d. reserved