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3 -28-14 Warm Up. Standard: S8P4 Students will explore the wave nature of sound and electromagnetic radiation. Ear canal– A narrow region leading from the outside of the human ear to the eardrum. Eardrum - A small, tightly stretched, drum-like membrane.
Ear canal– A narrow region leading from the outside of the human ear to the eardrum.
Eardrum- A small, tightly stretched, drum-like membrane.
Cochlea – A fluid-filled cavity in the inner ear that is shaped like a snail shell.
.(p559 in text)
Sound– A disturbance that travels through a medium as a longitudinal wave.
Ecolocation- The use of reflected sound waves to determine distances or to locate objects.
Acoustics– The study of how sounds interact with the environment.
Wave Interference– The interaction of waves when they meet. Two types: constructive and destructive. (p. 525)
Constructive Interference- waves combine to make a larger amplitude.
Destructive Interference– waves combine to make a smaller amplitude.
Take out a pencil and paper and clear your desk. Place the standard heading on your paper and title it: Vocab. Quiz 3-25-14. Also, if you need to take the Waves Quiz, Number another piece of paper 1-10, and title it: Waves Quiz.
Do not talk. If you are finished, turn your answer document over and read a book.
We will be going to the computer lab as soon as we are finished taking the quiz.
Mechanical Wave– Waves that require a medium through which to travel.
Reflection-The BOUNCING back of an object or a wave when it hits a surface through which it cannot pass. Think mirror.
Refraction– The BENDING of waves due to a change in speed.
Diffraction – When a wave moves AROUND a barrier or passes through a hole.
amplitude– The amount of energy a wave has and the distance between from the resting point and the crest of a wave. (p. 516)
frequency– The number of complete waves that pass a given point in a certain amount of time. Measured in Hertz (Hz).
wavelength– The measure from trough to trough or from crest to crest or from compression to compression.
speed – How far a wave travels in a given length of time. The formula is: speed = wavelength x frequency.
Sound is transmitted through a medium of gas, liquid or solid through longitudinal waves. Longitudinal waves are emitted parallel to the source. The higher the wave frequency (Hz), the higher the pitch.
Sound is transmitted through a _______of gas, liquid or solid through ________waves. ________waves are emitted ________to the source. The _________ the wave frequency (Hz), the higher the _______. The higher the wave’s Amplitude, the higher the wave’s ______.
crest– The highest part of a transverse wave.
trough– The lowest part of a transverse wave.
compression – The section(s) of a longitudinal wave that are close together like compressed coils on a spring.
Rarefactions – The section(s) of a longitudinal wave that are spread apart.
seismograph– An instrument that records the ground movements caused by seismic waves as they move through Earth. Used to detect earthquakes.
Mechanical Waves – Waves that require a medium to travel.
Vibration – A repeated back-and-forth or up-and-down motion. Waves result from vibration.
Transverse waves– Waves that move the medium at right angles to the direction in which the waves travel (think rope)
Longitudinal waves – Waves that move the medium parallel to the direction in which the waves travel. (think Slinky)
Reflection – The bouncing back of an object or a wave when it hits a surface through which it cannot pass. A reflection allows you to see yourself in a medium.