Ruben's Tube and Camera Obscura
What decibel level becomes painful to humans
130
Typical Human Hearing Falls Between
20 HZ and 20,000 HZ
When light has lower frequency, it's more
Blueshift
Sound is made of
Compressions and rarefactions
When two waves meet and their amplitudes temporarily combine to make a larger amplitude
Constructive Interference
When two waves meet and their amplitudes temporarily cancel out and make a smaller amplitude
Destructive Interference
Which best describes the pressure in a compression?
High Pressure
Volume
How loud a sound is PERCEIVED
What is it called when two waves meet when traveling along the same medium?
Interference
What happens when a wave pulse is reflected off a fixed position?
It goes back on the opposite side
The doppler effect works not only on sound but also on
Light
What kind of wave is sound?
Longitudinal, Mechanical
Which best describes the pressure in a rarefaction?
Low Pressure
Frequency
Number of waves per second
What does the frequency of a sound tell you about the sound?
Pitch
Pitch
Quality of a sound
When light has higher frequency, it's more
Redshift
Rarefactions and Compressions travel within
Sound
A combination of two waves meeting in opposite directions
Standing Wave
A pattern formed when a wave is bouncing back and forth in an environment
Standing Wave
Each time we go up by ten on the decibel scale, we double
The Volume
How does the doppler effect change the frequency of a sound when the observer is behind the moving object?
The observed frequency is decreased (the wavelengths are increased)
How does the doppler effect change the frequency of a sound when the observer is in front of the moving object?
The observed frequency is increased (the wavelengths are decreased)
The Doppler Effect is observed when
The source of a wave is moving with respect to the observer
What happens after two waves meet in a medium?
They pass through one another
What has to happen for a sound to be made?
Vibrations
What does the amplitude of a sound tell you about the sound?
Volume
How is a continuous standing wave formed?
When the two interferences meet and cancel each other out
Sound needs a medium to
compress
Sound begins with
vibration
