Question

1. In this homework, you will be using a sound simulation. We will demonstrate this simulation in class. If the simulation is too difficult to install on your computer, do not worry, you should still be able to answer the questions. It is important to know that a lighter shade of gray in the simulation indicates an increase in pressure compared to the undisturbed air pressure and a darker shade indicates an decrease in pressure. The simulation is available online from the class homepage: http://phet.colorado.edu/simulations/sims.php?sim=Sound. Begin by running the Sound Applet and exploring the various controls you have:
   You can change amplitude and frequency of the sound wave.
   You can move the listener toward or away from the speaker.
   You can turn the audio on or off, and you can listen to either the sound at the speaker or the sound heard by the listener.
   You can switch between the Listen Screen and the Measure Screen (you can ignore the other Screens for this assignment.)
   In the Measure Screen you have a ruler and timer which you can use to make measurements; you also have blue lines which you can move around to help you measure.
   You can stop, run, or advance frame by frame the sound waves.
   
   The Listen Screen of the sim lets you adjust the frequency and amplitude sliders and move the listener. The solid gray of the background represents the pressure of the air when no sound wave is present. Use the adjustments available to closely examine the relationship between the movement of the speaker cone and the sound waves produced and traveling away from the cone.
   
   After playing for a bit, come back here and decide whether each of the following statements are T-True, or F-False. (If the first is T and the rest are F, enter TFFFF)
   
   A) If the speaker produces larger fluctuations in pressure, the volume of the tone heard by the listener increases.
   B) To increase the volume of a tone at 400 Hz heard by the listener, the speaker must oscillate back and forth fewer times each second than it does to produce the tone with lower volume.
   C) To produce a lower pitch tone, the speaker must oscillate back and forth more times each second.
   D) When the speaker is producing sound waves, the motion of the speaker produces a slight increase in the pressure in front of the speaker during the forward motion of the speaker head and a slight decrease in pressure during the backward motion of the speaker head.
   E) In this simulation, a lighter shade of gray indicates an increase in pressure compared to the undisturbed air pressure.
   
   Be careful to input your answer as a string of 5 Ts and Fs, in order. (No spaces or any other characters)

Answer 1

a) true, as pressure difference increases, volume of sound increases as well.

b) False, frequency depends on no. of vibrations. here frequency is constant 400Hz. so no. of oscillations can't change instead we need to pressure difference.

c)False, The pitch depends on the frequency so for lower pitch, speaker must oscillate back and forth fewer times each second.

d)True, the motion of the speaker produces a slight increase in the pressure in front of the speaker during the forward motion of the speaker head and a slight decrease in pressure during the backward motion of the speaker head.

e) True, a lighter shade of gray in the simulation indicates an increase in pressure compared to the undisturbed air pressure and a darker shade indicates an decrease in pressure.