A Tiger Moth sitting on a tree emits ultrasound of frequency 20,561 Hz. This frequency is too high for humans to hear. The moth now starts flying towards or away from you, while continuing to emit the same sound. Due to the Doppler effect the pitch of the sound arriving at your ear drops to 20 kHz and you can just hear it. (a) is the moth moving towards or away from you? (Note: You only have one try for this multiple choice answer.) O moving away from you O moving towards you Why? (Note: You only have one try for this multiple choice answer.) O moving toward increases the wavelength and decreases the frequency O moving toward decreases the wavelength and increases the frequency O moving away increases the wavelength and decreases the frequency O moving away decreases the wavelength and increases the frequency (b) If the speed of sound is 343 m/s, what is the speed of the moth? m/s
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
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