1. How are sound waves created? 2. What is the difference between music and noise?
3. How do humans and other animals produces sound?
4. What are the three perceptual characteristics of sound? describe each.
5. What are the the three physical characteristics that correspond to the perceptual attributes?
6. What is the audible range of frequency for humans?
7. What is infrasound? ultrasounds?
8. Describe each part of the human ear.

Ans 1 - Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium.

Ans 2- Music is a sound that produces a pleasing sensation. It is produced by nature, musical instruments, human voice, etc. Noise is an unwanted and unpleasant sound produced by horns of vehicles, by machines, etc.

Ans 3 - Humans have elastic ligaments called vocal cords attached to the bones in the throat. When air is passed over these cords, they vibrate and make sound. ... Marine mammals also make many sounds by vibrating elastic ligaments (vocal cords) in the larynx.

Ans 4 - The physical characteristics of sound waves influence the three psychological features of sound: loudness, pitch, and timbre. Loudness depends on the amplitude,or height, of sound waves. The greater the amplitude, the louder the sound perceived. Amplitude is measured in decibels.

Ans 5 - The physical characteristics of sound waves influence the three psychological features of sound: loudness, pitch, and timbre. Loudness depends on the amplitude,or height, of sound waves. The greater the amplitude, the louder the sound perceived.

Ans 6 - about 20 Hz to 20 kHz

Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz. (Human infants can actually hear frequencies slightly higher than 20 kHz, but lose some high-frequency sensitivity as they mature; the upper limit in average adults is often closer to 15–17 kHz.)

Ans 7 - Explaining the terms infrasound and ultrasound, used for vibrations that we cannot hear. ... Beyond what we can hear there is: Infrasound, where the rate of vibration is too low for us to hear. Ultrasound, where the rate of vibration is too high for us to hear.

Ans 8 - Anatomically, the ear has three distinguishable parts: the outer, middle, and inner ear. ... The function of the outer ear is to collect sound waves and guide them to the tympanic membrane. The middle ear is a narrow air-filled cavity in the temporal bone.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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