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# sound

Academic Year 2019- 2020
First Term – worksheet
Name: ____________________________
Date: _________________
Part A: Understanding Vocabulary
Doppler effect
Sonogram
consonance
pitch
Acoustics
Supersonic
compressions rarefactions
W/m2
decibels (dB)
frequency
Hertz (Hz)
musical scales
beat
longitudinal
Resonance
solids
gases
Select the correct term to complete the sentences.
1. The loudness of a sound wave is measured in ____.
2. The ____________ of a sound is how high or low we hear its frequency.
3. The shift in sound frequency caused by a moving sound source is called the
___________________
4. The unit of sound intensity is ______________
5. Most music is based on patterns of frequencies called ____.
6. A sound wave is an example of a(n) ______________ wave.
7. A sound wave consists of a series of ______________ and ______________.
8. The human perception of pitch depends on a sound’s _________________.
9. The unit of frequency is ______________
10. The unit of sound intensity is ________________
11. When the frequency of a force applied to a system matches the natural
frequency of vibration of the system, ______________ occurs.
12. In general, sound travels faster through _____________
Part B: Which wave have high frequency?
Part C: Calculate the given below using appropriate formula
1. What is the intensity of the sound waves produced by a guitar at 4 m when the
power output of the guitar is 0.30 W?
2. If the intensity of a person’s voice is 4.6 &times; 10−7 W/m2 at a distance of 2 m, how
much sound power does that person generate?
Part D: Explain the given question below
Explain why the speed of sound depends on the temperature of the medium. Why is
this temperature dependence more noticeable in a gas than in a solid or a liquid?