Physics 1.3 - Sound Waves Flashcards
What type of wave is sound?
Longitudinal
How is sound made?
If nodes and antinodes are in the right spots, the object will resonate. This causes sound
What is the equation for the speed of sound?
V=331+.6T
What happens to sound with constructive and deconstructive interferance?
Constructive interference causes amplitude (Volume) increase. Deconstructive interference causes amplitude decrease
What is the Doppler Effect?
The perceived change in pitch (frequency) of a sound detected by a listener, compared to the actual pitch produced by a moving source
In point form, Describe the Doppler Effect
-When sound source is moving, the wavelength decreases
-Person will hear more waves arriving per second than there actually is. This will also cause higher frequency
-Sound source is passing by the wavelength increases
-Person will hear lower frequencies
How much range is from quietness to loudness?
10^12 x the energy
What is sound intensity measured in?
Decibels - dB
What is the quietest sound that can be heard by a person? what is this called?
- 0dB
- Threshold of Hearing
What is the loudest sound our ears can tolerate? what is this called?
- 120 dB
- Threshold of pain
For every __a)__ increase in sound intensity, the loudness will __b)__
a) 10dB
b) double
What are Beats?
When interference occurs in sound waves with close frequencies
What is Resonance?
When a substance vibrates “as a unit” as its fundamental frequency
How does Resonance occur?
Vibration of an object travels through an object and reflects back over itself from one or both ends
Antinodes are found in __a)__ Interference and Nodes are found in __b)__ interference
a) constructive interference
b) Deconstructive interference