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 × 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?