- Look at the diagram above. The energy carried by this wave is dependent on
Your answer:
the wavelength of the wave
the frequency of the wave
the speed of the wave
the amplitude of vibration of the particles in the medium
- From the diagrams above the mechanical wave(s) carrying the most energy is
Your answer:
E and F
B,C and F
D only
F only
- If the amplitude of a mechanical wave is tripled the energy carried by the wave will...
Your answer:
triple
increase nine times
stay the same
increase twenty seven times
- A spherical sound is produced and spreads outwards from the source. At three times the distance from the source the amplitude and intensity of the wave will be...
Your answer:
1/3 and 1/9 as much
both 1/9 as much
both 1/3 as much
3 and 9 times as much
- The human ear is most sensitive to sound with a frequency range of...
Your answer:
3000 to 5000 Hz
100 - 500 Hz
25000 - 30000 Hz
5000 - 15000 Hz
- When the frequency of a source is doubled, the sound produced
Your answer:
travels at twice its former speed
has half its former wavelength
has twice its former wavelength
travels at half its former speed
- if a sound of intensity I = 1x10^-6 W/m^2 falls on a detector of area A = 7x10^- 5 m^2 (about the size of your eardrum), how much power is received by the detector?
Your answer:
1.0x10^-6 W
1.4x10^-2 W
6.2x10^-14 W
7.0x10^-11 W
- A magnitude 6 earthquake compared to a magnitude 8 earthquake carries:
Your answer:
1/900 as much energy
100 times as much energy
900 times as much energy
1/100 as much energy
- Compared to a magnitude 4.3 earthquake, a magnitude 6.7 earthquake has an amplitude which bigger by a factor of:
Your answer:
1.56
0.64
3.5x10^3
251
- Intensity of an Earthquake P wave 200 km from the source is 2.0 x 106 W/m^2 . What is the intensity 700 km from the source?
Your answer:
2857 W/m^2
5.7x10^5 W/m^2
1.6x10^5 W/m^2
2.0x10^6 W/m^2
- Two sounds have a difference in intensity level of 12 dB. How much more intense is one sound than the other?
Your answer:
16
12
32
10^12
- The intensity of a rock concert is about 10,000 times that of a dog’s bark. How much louder would the rock concert appear to be?
Your answer:
10^4 times
4 times
40 times
16 times
- In diagram 5-81 (above), a person positioned at point A would perceive __________ frequency as the person positioned at point B.
Your answer:
the same
higher
lower
no answer
- A police car comes down the road with its siren on. As it passes you the perceived pitch of the sound:
Your answer:
will gradually get higher as it approaches and then lower as it moves away.
will stay constant as it approaches and moves away
will gradually get lower as it approaches and then higher as it moves away.
will suddenly drop as it passes.
- A police car siren is 1500 Hz when at rest. If the car moves away from an observer at 30 m/s, what frequency does the observer detect?
Your answer:
1379 Hz
1644 Hz
1500 Hz
1200 Hz
- If the police car (in question 15) travelling at 40 m/s chases a speeder traveling at 30 m/s, what frequency will the speeder hear?
Your answer:
1847 Hz
1226 Hz
1461 Hz
1550 Hz
- The shock wave produced by an aircraft moving through air is shown above. Determine the mach # of the plane.
Your answer:
1.5
1
2.5
2
- For question 17, determine the half-cone angle of the shock wave
Your answer:
43.2 degrees
0.411 degrees
23.6 degrees
35.7 degrees
- The half angle of the conical shock wave produced by a supersonic aircraft is 60 degrees. What is the Mach number of the aircraft?
Your answer:
1.73
2.0
1.15
0.87
- If a jet-plane goes from mach-1 to mach 2, the half angle of the conical shock wave will.....
Your answer:
no answer
increase
decrease
stay the same