1. Q16.1
At a compression in a sound wave,
1. particles are displaced by the maximum distance in the same direction as the wave is moving
2. particles are displaced by the maximum distance in the direction opposite to the direction the wave is moving
3. particles are displaced by the maximum distance in the direction perpendicular to the direction the wave is moving
4. the particle displacement is zero

2. A16.1
At a compression in a sound wave,
1. particles are displaced by the maximum distance in the same direction as the wave is moving
2. particles are displaced by the maximum distance in the direction opposite to the direction the wave is moving
3. particles are displaced by the maximum distance in the direction perpendicular to the direction the wave is moving
4. the particle displacement is zero

3. Q16.2
Increasing the pressure amplitude of a sound wave by a factor of 4 (while leaving the frequency unchanged)
1. causes the intensity to increase by a factor of 16
2. causes the intensity to increase by a factor of 4
3. causes the intensity to increase by a factor of 2
4. has no effect on the wave intensity
5. answer depends on the frequency of the sound wave

4. A16.2
Increasing the pressure amplitude of a sound wave by a factor of 4 (while leaving the frequency unchanged)
1. causes the intensity to increase by a factor of 16
2. causes the intensity to increase by a factor of 4
3. causes the intensity to increase by a factor of 2
4. has no effect on the wave intensity
5. answer depends on the frequency of the sound wave

5. Q16.3
Increasing the frequency of a sound wave by a factor of 4 (while leaving the pressure amplitude unchanged)
1. causes the intensity to increase by a factor of 16
2. causes the intensity to increase by a factor of 4
3. causes the intensity to increase by a factor of 2
4. has no effect on the wave intensity
5. answer depends on the frequency of the sound wave

6. A16.3
Increasing the frequency of a sound wave by a factor of 4 (while leaving the pressure amplitude unchanged)
1. causes the intensity to increase by a factor of 16
2. causes the intensity to increase by a factor of 4
3. causes the intensity to increase by a factor of 2
4. has no effect on the wave intensity
5. answer depends on the frequency of the sound wave

7. Q16.4
The air in an organ pipe is replaced by helium (which has a lower molar mass than air) at the same temperature. How does this affect the normal-mode wavelengths of the pipe?
1. the normal-mode wavelengths are unaffected
2. the normal-mode wavelengths increase
3. the normal-mode wavelengths decrease
4. answer depends on whether the pipe is open or closed

8. A16.4
The air in an organ pipe is replaced by helium (which has a lower molar mass than air) at the same temperature. How does this affect the normal-mode wavelengths of the pipe?
1. the normal-mode wavelengths are unaffected
2. the normal-mode wavelengths increase
3. the normal-mode wavelengths decrease
4. answer depends on whether the pipe is open or closed

9. Q16.5
The air in an organ pipe is replaced by helium (which has a lower molar mass than air) at the same temperature. How does this affect the normal-mode frequencies of the pipe?
1. the normal-mode frequencies are unaffected
2. the normal-mode frequencies increase
3. the normal-mode frequencies decrease
4. answer depends on whether the pipe is open or closed

10. A16.5
The air in an organ pipe is replaced by helium (which has a lower molar mass than air) at the same temperature. How does this affect the normal-mode frequencies of the pipe?
1. the normal-mode frequencies are unaffected
2. the normal-mode frequencies increase
3. the normal-mode frequencies decrease
4. answer depends on whether the pipe is open or closed