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Science study guide and key words christmas time

Terms in this set (28)

compressible materials
materials made of two or more substances combined to give the product useful properties of each of its components.
sound
energy produced by an object's vibration
decibel
the most common unit used to measure the intinsity of sound
doppler effect
the change in the frequency and pitch of a sound caused by the motion of the sound source or listener.
frequency
the number fo complete waves that pass a particular point in a unit of time.
intensity
the amount of energy a sound wave carries in a light's brightness.
loudness
how strong the sound seems to us when it strikes our ears.
pitch
how high or low a sound is
ultrasonic waves
sound frequencies higher than 20,000 HZ
music
a sound with a pleasing quality an identifiable pitch and a repeated timing called rhythm.
noise pollution
a level of noise that causes irritation pain or damage to the body.
resonance
what occurs when an object vibrating ot near natural frequency of a second object causes the second object to vibrate.
sonar
a method of using ultrasonic waves to calculate underwater distances or locate underwater objects.
timbre
the quality of a sound that distinguishes it from other sounds of the same pitch and volume
how does sound form as energy
through vibrations
Explain how sound waves are designed
Sound waves are designed when the object causes compressions and rarefactions to form particles in the air.
Discover that sound waves need a medium through which to travel.
Sound waves need a medium to travel through a medium because because sound waves cannot compress molecules that are close together.
Understand how the design of the different phases contributes to the way that sounds travel.
Phrases contribute to the sounds because the phases can be dense/ The phases contribute to the medium and where soildis are the best then liquids then gases. ESSAY!!!!!!!!! Explain the differences
how do we detect sound
We detect sound through our ear drum when the sound waves enter our ear our ear drum vibrates then going to our nerves and then it transfers it to the brain where we hear it.
can you hear on the moon
no
Why does sound travel at different rates through:, solids, liquids, and gases?
Because the molecules are more compressed or more, dense
How do you determine the speed and sound in various mediums?
You do that by measuring the frequency
Explain the properties of sound like, frequency and intensity
Frequency is the number of complete waves that pass a particular point in time and intensity is the amount of energy that a sound wave it carries.
Be able to discuss the relationship of frequency to pitch
Pitch is how high or low a sound whereas if you did not have frequency you would not have ,pitch.
Be able to explain the Doppler effect.
The doppler effect is the change in the frequency and pitch of a sound caused by the motion of the sound source or the listener.
Evaluate noise pollution
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Use the kinetic theory of matter to explain what happens to molecules as sound waves travel through the following: sound, liquid, and gases. Explain each in detail.
Sound waves travel through solids the best because the materials will allow compressions to travel quickly through it . the energy waves will travel faster because in solids the molecules are tightly held together but they still have enough energy kinetic energy to vibrate back and forth. The structure keeps them moving so that they quickly bounce back into place after the compressions and rarefactions of the sound waves have passed Where with liquids the particles they are moreloose and are not all the way packed together they keep rolling over one another. This keeps the molecules from bouncing back into one another. With Gas, because the molecules are so loosely packed together they have total freedom of movement and do not bounce back and forth than that of a solid.
Explain the relationship between the intensity of sound, decibel levels, and hearing loss. Give two examples of sounds and their typical decibel levels.
The typical decibel of thunder is usually 120 decibel and a jet engine is 170 decibels the intensity of sound is the amount of energy a sound wave carries. Hearing loss can happen usually around 120 decibels.
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