Exploring Physics Chapters 8-10 Flashcards
The bending of the sun’s rays at sunset is an example of
refraction.
The frequency of a sound is known as its
pitch
How many decibels is ordinary conversation?
50-60
If pitch increases, then source and observer must be moving ___ one another.
toward
How many decibels is the average home sounds such as the humming of a refrigerator?
20-30
As sound waves spread out, they grow weaker by the ___ of the distance.
square
is a surface of light sensitive nerves.
retina
The eye has cones that can detect red, green, and ___ light.
blue
The pitch of a string on a stringed instrument depends on the length, thickness, and _______________ of the string.
tension
The frequency of light is its
color.
The study of sound is known as
acoustics
Sound waves travel at the ___ in air depending on their source.
same speed
is the opening through which light enters the eye.
pupil
Coulomb’s law of static electric force is very similar to Newton’s law of gravity, but with ___ replacing mass.
charge
Thales of Melitus discovered that ___ could be given a charge of static electricity.
amber
The image behind a flat mirror is a (A. real, B. virtual) image.
virtual
The speed of light is ___ in water than in air.
slower
carries information from the eye to the brain.
optic nerve
The ohm is a unit for measuring
resistance
To reduce the heating effect of electricity in wires, the current is reduced but the ___ is increased.
voltage
is sensitive to light and can distinguish color.
cones
An object with a ___ charge has more protons than electrons.
positive
Which moves more freely, an electron or proton?
electron
How many decibels is the rustling of leaves?
8
State Ohm’s law
current = voltage/resistance, or in words: current is directly proportional to voltage and inversely proportional to resistance.
High frequency, ultrasonic sounds reflect ___ from small objects than low frequency sounds.
better
adjusts light to the best focus.
lens
The ___ pitch an object can make is known as its natural or fundamental frequency.
lowest
How many decibels is a whisper?
10-20
How many decibels is an automobile
40-50
The force that pushes electrons around a circuit is
voltage
Do all metals conduct electricity?
yes
The three properties of a sound are frequency, intensity, and ___.
quality
controls the amount of light that enters the eye.
iris
List two examples of a practical use found for battery-powered vehicles?
golf carts and hybrid cars
How many decibels is thunder?
110
Sunlight is a mixture of all the colors of the
rainbow.
Which is stronger, electrostatic or gravity?
electrostatic
The distance along a wave, including crest and trough, is its
wavelength
How many decibels is heavy street traffic?
70-80
The observation that light bounces from a mirror at the same angle at which it enters is known as the law of
reflection.
Most modern large telescopes use a ___ to collect light and bring it to a focus.
mirror
A lens thicker in the middle than at the edges is
convex.
The loudness of sound is measured in
decibels
brings light to a focus.
cornea
Glass is an example of a
nonconductor
How many decibels is a jack hammer?
90-100
is sensitive to light but cannot see color.
rods
