Exploring Physics Chapters 8-9 Flashcards
The distance along a wave, including crest and trough, is its
wavelength
The frequency of a sound is known as its
pitch
The ___ pitch an object can make is known as its natural or fundamental frequency.
lowest
The loudness of sound is measured in
decibels
If pitch increases, then source and observer must be moving ___ one another.
toward
is a surface of light sensitive nerves.
retina
The speed of light is ___ in water than in air.
slower
How many decibels is an automobile
40-50
Sunlight is a mixture of all the colors of the
rainbow.
The three properties of a sound are frequency, intensity, and ___.
quality
Most modern large telescopes use a ___ to collect light and bring it to a focus.
mirror
How many decibels is heavy street traffic?
70-80
is the opening through which light enters the eye.
pupil
As sound waves spread out, they grow weaker by the ___ of the distance.
square
How many decibels is the average home sounds such as the humming of a refrigerator?
20-30
controls the amount of light that enters the eye.
iris
High frequency, ultrasonic sounds reflect ___ from small objects than low frequency sounds.
better
The pitch of a string on a stringed instrument depends on the length, thickness, and _______________ of the string.
tension
The bending of the sun’s rays at sunset is an example of
refraction.
The eye has cones that can detect red, green, and ___ light.
blue
Sound waves travel at the ___ in air depending on their source.
same speed
is sensitive to light and can distinguish color.
cones
A lens thicker in the middle than at the edges is
convex.
is sensitive to light but cannot see color.
rods
carries information from the eye to the brain.
optic nerve
How many decibels is the rustling of leaves?
8
How many decibels is a jack hammer?
90-100
The observation that light bounces from a mirror at the same angle at which it enters is known as the law of
reflection.
How many decibels is a whisper?
10-20
The image behind a flat mirror is a (A. real, B. virtual) image.
virtual
adjusts light to the best focus.
lens
How many decibels is ordinary conversation?
50-60
The frequency of light is its
color.
How many decibels is thunder?
110
The study of sound is known as
acoustics
brings light to a focus.
cornea
