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Multiple choice. Indicate the best answer. What type of wave is sound? a. Surface wave b. Longitudinal wave c. Transverse wave d. Tidal wave How many beats per second will you hear when listening to sounds of 512 Hz and 515 Hz at the same time? . a.2 b. 3 c. 5 d. 513.5 A singer breaking a glass with her voice is an example of: a. Diffraction b. Beats c. Resonance d. Amplitude . WW Which of the below sounds would be quieter and a lower pitch than the sound below to the right? The picture to the right represents the fundamental frequency of a musical instrument. Which of the following would NOT represent a harmonic wave of this fundamental frequency? . You are standing on a train platform as a train approaches at a 60 m/s. The train whistle emits a sound with a frequency of 723 Hz. Which of the following graphs best represents the frequency of the sound you hear as the train approaches, passes and then departs the platform without changing speed? Frequency (Hz) a platform platform Frequency (Hz) Frequency (Hz) Approaching eparting platform d. platform Departing . In order for a fighter jet to create a sonic boom, the jet must be traveling the speed of sound . a. slower than b. precisely at c. quicker than An observer can hear a higher or a lower frequency than the actual frequency of a source because of the Doppler Effect. Describe the conditions necessary for the Doppler effect and provide one real example where you might expect to hear the Doppler effect