3.4 Sound
3.4.2—Longitudinal nature of sound waves
3.4.3—Approximate range of frequencies
3.4.4—A medium is needed to transmit sound
3.4.5—Speed of sound in air is approximately
3.4.6—Method involving a measurement of
3.4.7—Changes in amplitude and frequency
3.4.8—An echo as the reflection of sound
3.4.9—Ultrasound as sound with a frequency
3.4.10—Compression and rarefaction
3.4.11—That, in general, sound travels faster
3.4.12—Uses of ultrasound in non- destructive
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