Flashcards in Chapter 9 Waves Deck (49):
transmitter of energy without the movement of particles from place to place. The vibration of particles or energy fields is involved.
wave involving the vibration of particles perpendicular to the direction of energy transfer
Compression Wave / Longitudial Waves
wave involving the vibration of particles in the same direction as energy transfer
material through which a wave moves
repeated fast back-and-forth movements
region in which the particles are closer than when not disturbed by a wave
region in which the particles are further apart than when not disturbed by a wave
number of vibrations in one second, or the number of wavelengths passing in one second
unit of frequency; its abbreviation is Hz. One hertz is equal to one vibration every second.
Highness or lowness of a sound. The pitch that you hear depends on the frequency of the vibrating air.
distance between two neighbouring crests or troughs of a wave. This is the distance between two particles vibrating in step.
maximum distance that a particle moves away from its undisturbed position
use of reflected sound waves to locate objects under water (sound navigation and ranging)
Use of sound to locate objects by detecting echoes
sound with frequencies too high for humans to hear
the tube that leads from the outside of the ear to the eardrum
a thin piece of stretched skin inside the ear that vibrates when sound waves reach it
a thin layer of tissue
the fleshy outside part of the ear
the snail-shaped part of the inner ear. It is lined with tiny hairs that are vibrated by sound and stimulate the hearing receptors.
three curved tubes, filled with fluid, in the inner ear that control your sense of balance
a large nerve that sends signals to the brain from the hearing receptors in the cochlea
a set of three tiny bones that send vibrations from the eardrum to the inner ear. They also make the vibrations larger.
an egg-shaped hole covered with a thin tissue. It is the entrance from the middle ear to the outer ear.
a measure of how loud a sound is using a sound meter
the energy of sound that is an indication of the loudness of a sound
a unit of measurement of relative sound intensity
Threshold of Hearing
the lowest level of sound that can be heard by the human ear
Threshold of Pain
the lowest level of sound that causes pain to the human ear
complete range of wavelengths of energy radiated as electric and magnetic fields
low energy electromagnetic waves with a much lower frequency and longer wavelength than visible light
nvisible radiation emitted by all warm objects. You feel infra-red radiation as heat.
very small part of the electromagnetic spectrum to which our eyes are sensitive
invisible radiation similar to light but with a slightly higher frequency and more energy
high-energy electromagnetic waves that can be transmitted through solids and provide information about their structure
high-energy electromagnetic radiation produced during nuclear reactions. They have no mass and travel at the speed of light.
electromagnetic energy that is transmitted as moving electric and magnetic fields. There are many different types of electromagnetic energy, e.g. light, microwaves, radio waves.
narrow beams of light
wide stream of light rays, all moving in the same direction
bouncing off the surface of a substance
releasing its own light
describes light sent in many directions by small particles within a substance
describes a substance that allows most light to pass through it. Objects can be seen clearly through transparent substances.
allowing light to come through imperfectly, as in frosted glass
describes a substance that does not allow any light to pass through it
change in the speed of light as it passes from one substance into another. It usually involves a change in direction.
a line drawn perpendicular to a surface at the point where a light ray meets it