Unit 10 Flashcards
(19 cards)
Define pitch
What you hear based on frequency
Define interference
Superposition of two waves
Define Doppler effect
Apparent shift of frequency due to motion
Define beat
Interference between two sound waves with similar frequencies
Define Natural frequency
The frequency an object tends to vibrate at
Define resonance
Forced vibrations of an object
Define harmonic motion
Vibrations of an object around an equilibrium position
Define medium
The material a wave flows through
How did the following factors affect the period of mass on a spring
- mass
- amplitude
- spring constant
- gravity
- mass: square root
- amplitude: no relationship
- spring constant: inverse
- gravity: no relationship
How did the following factors affect the period of a pendulum
- mass
- Amplitude
- length
- gravity
- mass: no relationship
- amplitude: no relationship
- length: square root
- gravity: inverse
What is the difference between transverse and longitudinal waves?
- Transverse: particles vibrate perpendicular to the direction of motion
- longitudinal: particles vibrate in the same direction
What does wave speed depend on?
The medium
What is diffraction?
The bending of a wave around a barrior
What is the difference between constructive and destructive interference?
- constructive: two waves combine to make a bigger wave
- destructive: two waves combine to make a smaller wave
Suppose three tuning forks of frequencies 260 Hz, 262 Hz, and 266 Hz are available. What beat frequencies are possible for pairs of these tuning forks sounded together? What causes this phenomenon?
- 2 Hz, 4 Hz, and 6 Hz
- interference/supperposition
What is the difference between a node and an antinode?
- node: a stationary point on a standing wave
- antinode: a point of maximum displacement
How is sound produced?
Vibrations
Describe the decibel scale. If a noise has a sound level of 40 dB, and a second noise has a sound level of 60 dB, how much louder does it appear to be?
- Logarithmic scale -> based on amplitude
- 4 times bigger
How is the Doppler effect produced and what will you hear?
- when a source is moving and producing sound
- approaching: high frequency + pitch, low wavelength
- going away: low frequency + pitch, high wavelength
