Vocabulary 1
The highest points on a wave
What are crests?
The lowest points on a wave.
What are troughs?
Sound is this type of wave.
What is longitudinal?
An indication of how high or low a sound is, primarily determined by the frequency of the sound wave.
What is pitch?
This tells the height of the wave and governs the loudness of a sound wave.
What is amplitude?
This is the definition for frequency.
What is how many waves hit a certain point every second.
What is the description for wavelength?
What is the distance between crests & troughs?
This is the definition of a longitudinal wave.
What is a wave with a direction of vibration that is parallel to its direction of travel?
Sound waves with low pitch have _____ frequency, and sound waves with high pitch have _____ frequency.
What is low and high?
This scale measures the loudness or intensity of sound.
What is the bel scale?
The description for compressions & rarefactions is this.
What are the bunched up sections of a transverse wave and the pulled apart sections of a transverse wave?
This is the unit used in frequency problems.
What is Hertz?
DAILY DOUBLE: This is the formula used to solve frequency problems.
Frequency = speed divided by wavelength OR
F = V
Lambda
A longitudinal wave is suddenly stretched so that its wavelength is increased. What will happen to the wave's frequency?
What is decrease?
4 bels = this many decibels.
What are 40 decibels?
DAILY DOUBLE: This is the definition of a transverse wave.
What is a wave with a direction of vibration that is perpendicular, or at right angles, to its direction of travel?
The sound produced as a result of an object traveling at or above Mach 1.
What is a sonic boom?
This is the formula you would use to answer this question: What is the speed of sound in air that has a temperature of 24o C?
V = 331.5 + 0.6 (Temp) meters/seconds
DAILY DOUBLE: A mom needs to call her kids for lunch at the pool. Will the kids hear her better if she calls them above or under the water?
What is under the water?
The sound from a normal conversation is about 60 decibels, while the sound of a shotgun firing is about 170 decibels. How many bels more intense is the shotgun firing than the conversation.
What are 17 bels - 6 bels = 11 bels louder?
This is why you won't be able to hear an alarm go off if it is inside an airless bell jar.
What is sound needs a medium through which to travel?
DAILY DOUBLE: Are the wavelengths of infrasonic waves shorter or longer than the wavelengths of sonic waves?
What is longer? Because - lower frequency = lower pitch = longer wavelengths
A siren will get softer and softer when it is moving toward you or away from you (choose the best answer) and WHY?
What is the siren is moving further away from you? You know this because the sound waves are being pulled apart, which produces a longer wavelength, a lower frequency, and a lower pitch.
You hear 2 dogs howling. They both have the same pitch, but the first is not as loud as the second. If you compare the sound waves of each sound, this aspect(s) of the wave (wavelength, frequency, speed, & amplitude) would be the same. This would be different.
What is the wavelength, frequency, & speed will all be the same, but the amplitude of the waves will be different? (Because amplitude determines loudness)
DAILY DOUBLE: The following are 2 uses for reflected sound waves.
What are ultrasonic rulers, medical imaging, or sonar? (Must list 2)