Sound and Speed
SPH3UC – Lesson 1
1. A) Amplitude is the distance between the equilibrium and the maximum displacement. In this wave, it would be from the equilibrium to the top of the crest or bottom of the trough.
B)
C) Speed: m/s Frequency: Hz
D)
Speed: because speed is constant and not affected by the change in frequency.
Wavelength:0.4 Hz.
2. In transvers waves the motion of the particles is perpendicular to the direction of the energy. In longitudinal waves it they are parallel to each other.
Wavelength is the distance a wave has travelled after one cycle and does not change. Amplitude is the distance between the equilibrium and the maximum displacement of the wave, and it decreases as a wave travels through a medium.
Period is the time it takes to complete one cycle. Frequency is the number of cycles completed in one second.
3. Before:
After:
Fixed end
4.
Period:
Frequency:
Time to complete 5.0 cycles:
Lesson 2
5.
Speed:
Temp:
6. If the air temperature increases the speed of the sound will increase, because for every increase of 1 the speed of sound increase by 0.59m/s
7. If the temperature of the air increases the wavelength will also increase because the speed of the sound increases. In order to stay at 420Hz, the wavelength must increase.
8.
Speed of sound in air:
Moving towards: 425Hz
Moving away: 378Hz
9. The frequency of the horn is different when approaching than when moving away because the waves ahead of the train are compressed and those behind it are stretched out. This causes the sounds at the front of the train to sound higher in frequency than those behind it. Therefore as the train approaches the observer hears the higher pitch, and as it moves away, the lower pitch.
10. Saltwater 1470m/s, 0.40s to return
0.40) = 588m
Air 340m/s, ?s to return
1. A) Amplitude is the distance between the equilibrium and the maximum displacement. In this wave, it would be from the equilibrium to the top of the crest or bottom of the trough.
B)
C) Speed: m/s Frequency: Hz
D)
Speed: because speed is constant and not affected by the change in frequency.
Wavelength:0.4 Hz.
2. In transvers waves the motion of the particles is perpendicular to the direction of the energy. In longitudinal waves it they are parallel to each other.
Wavelength is the distance a wave has travelled after one cycle and does not change. Amplitude is the distance between the equilibrium and the maximum displacement of the wave, and it decreases as a wave travels through a medium.
Period is the time it takes to complete one cycle. Frequency is the number of cycles completed in one second.
3. Before:
After:
Fixed end
4.
Period:
Frequency:
Time to complete 5.0 cycles:
Lesson 2
5.
Speed:
Temp:
6. If the air temperature increases the speed of the sound will increase, because for every increase of 1 the speed of sound increase by 0.59m/s
7. If the temperature of the air increases the wavelength will also increase because the speed of the sound increases. In order to stay at 420Hz, the wavelength must increase.
8.
Speed of sound in air:
Moving towards: 425Hz
Moving away: 378Hz
9. The frequency of the horn is different when approaching than when moving away because the waves ahead of the train are compressed and those behind it are stretched out. This causes the sounds at the front of the train to sound higher in frequency than those behind it. Therefore as the train approaches the observer hears the higher pitch, and as it moves away, the lower pitch.
10. Saltwater 1470m/s, 0.40s to return
0.40) = 588m
Air 340m/s, ?s to return