Exploring Physics Chapter 8 Flashcards
How many decibels is heavy street traffic?
70-80
How many decibels is the rustling of leaves?
8
How many decibels is a jack hammer?
90-100
If pitch increases, then source and observer must be moving ___ one another.
toward
As sound waves spread out, they grow weaker by the ___ of the distance.
square
The frequency of a sound is known as its
pitch
The loudness of sound is measured in
decibels
Sound waves travel at the ___ in air depending on their source.
same speed
The study of sound is known as
acoustics
How many decibels is thunder?
110
The ___ pitch an object can make is known as its natural or fundamental frequency.
lowest
How many decibels is an automobile
40-50
How many decibels is a whisper?
10-20
The three properties of a sound are frequency, intensity, and ___.
quality
The distance along a wave, including crest and trough, is its
wavelength
The pitch of a string on a stringed instrument depends on the length, thickness, and _______________ of the string.
tension
How many decibels is the average home sounds such as the humming of a refrigerator?
20-30
High frequency, ultrasonic sounds reflect ___ from small objects than low frequency sounds.
better
How many decibels is ordinary conversation?
50-60
