Flashcards in Year 9 Physics Deck (41):
A wave is a transmitter of energy without the movement of particles from place to place. The vibration of particles or energy fields is involved.
Define Transverse Waves...
wave involving the vibration of particles perpendicular to the direction of energy transfer
Define Compression Waves ...
wave involving the vibration of particles in the same direction as energy transfer
What is Longitudinal wave?
Another word for compression wave.
Define a Medium...
material through which a wave moves
repeated fast back-and-forth movements
Define Compression ...
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
highness or lowness of a sound. The pitch that you hear depends on the frequency of the vibrating air.
unit of frequency; its abbreviation is Hz. One hertz is equal to one vibration every second.
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
Define Sonar ( SOund Navigation and Ranging )...
use of reflected sound waves to locate objects under water (sound navigation and ranging)( 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
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
(dB) unit of measurement of relative sound intensity
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
ringing or similar sensation of sound in the ears, caused by damage to the cells of the inner ear
a device implanted behind the ear that detects and processes sound, then sends signals to the auditory nerve so that severely deaf people can hear
narrow beams of light, You cannot see a single light ray.
wide stream of light rays, all moving in the same direction, You can see beams of light only when particles in substances like air scatter,
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