# Shared Flashcard Set

## Details

Waves, sound & light
properties of waves, sound and light
44
Physics
03/13/2014

Term
 What types of waves require a medium?
Definition
 mechanical
Term
 Define transverse wave & give a real world example.
Definition
 a wave that vibrates perpendicular to the wave's motionex: seismic waves
Term
 Define longitudinal wave & give a real world example.
Definition
 a wave that has a disturbance that is parallel to the wave's motionex: sound
Term
 Define frequency
Definition
 how many wave cycles pass a given point in a certain amount of time (usually one second)
Term
 Define wavelength
Definition
 distance between 2 consecutive points on a wave
Term
 Define amplitude
Definition
 distance from equilibrium
Term
 How are frequency and wavelength related?
Definition
 as wavelength increases, frequency decreases
Term
 How are frequency and period related?
Definition
 as frequency increases, period decreases
Term
 Define period
Definition
 the time it takes for one wave cycle to occur
Term
 How are period and wavelength related?
Definition
 as period increases, wavelength increases
Term
 What factors affect the speed of a wave.
Definition
 medium properties
Term
 What factors affect the period of a pendulum?
Definition
 acceleration due to gravity and length of the string
Term
 Describe (and draw) what happens when 2 waves meet with constructive interference.
Definition
 the amplitude of the resultant wave is greater
Term
 Describe (and draw) what happens when 2 waves meet with destructive interference.
Definition
 the amplitude of the resultant wave is smaller
Term
 Which harmonics are possible when a string vibrates?
Definition
 all harmonics
Term
 Which harmonics are possible when air vibrates in an open column?
Definition
 all harmonics
Term
 Which harmonics are possible when air vibrates in a closed column?
Definition
 only the odds
Term
 A clock pendulum with a mass of 0.52 kg and a length of 62 cm, has a period of 0.95 s. How much longer would it have to be to have a period of 1 s?
Definition
 2.4 cm longer
Term
 When an orchestra is tuning up, the first violinist plays a note at 256 Hz. What is the wavelength of that sound wave if the speed of sound in the hall is 340 m/s? What is the period?
Definition
 1.3 m0.00391 s
Term
 Geo is standing on a breakwater and he notices that one wave goes by every 4.2 s. The distance between crests is 12.3 m. What is the frequency and speed?
Definition
 0.24 Hz2.9 m/s
Term
 A sub is traveling toward a stationary detector. If the sub emits a 260 Hz sound that is received by the detector as a 262 Hz sound, how fast is the sub traveling. Use 1533 m/s for the speed of sound in water.
Definition
 12 m/s
Term
 A 350 Hz tuning fork is held over the end of a pipe that is inserted into water. What is the spacing between the resonance lengths of the pipe if the speed of sound is 348 m/s?
Definition
 0.50 m
Term
 The lowest note on an organ is 16.4 Hz. What is the shortest open organ pipe that will resonate at this frequency? What is the pitch if the same organ pipe is closed?
Definition
 10.5 m8.2 Hz(answers may be rounded)
Term
 A fire truck is moving at 35 m/s, and a car in front of the truck is moving in the same direction at 15 m/s. If a 327 Hz siren blares from the truck, what frequency is heard by the driver of the car?
Definition
Term
 Water waves in a lake travel 3.4 m in 1.8 s. The period of oscillation is 1.1 s. What is the speed of the water waves? What is their wavelength?
Definition
 1.9 m/a2.1 m
Term
 How long must a pendulum be to have a period of 2.3 s on the Moon, where acceleration due to gravity is 1.6 m/s/s?
Definition
 0.21 m
Term
 A sound wave of wavelength 0.6 m and a velocity of 330 m/s is produced for 0.5 s. What is the frequency?
Definition
 550 Hz (answer may be rounded)
Term
 The speed of sound in water is 1498 m/s. A sonar signal is sent straight down from a ship at a point just below the water surface, and 1.8 s later the reflected signal is detected. How deep is the water?
Definition
 1350 m
Term
 How are pitch and frequency related?
Definition
 as frequency goes up, pitch goes up
Term
 How are amplitude and loudness related?
Definition
 as amplitude increases, loudness increases
Term
 What is the Doppler Effect?
Definition
 the change in frequency of a sound caused by a moving source, a moving detector or both
Term
 As a moving sound is coming toward you, how does the detected pitch differ?
Definition
 the detected pitch is higher than the actual pitch because the wavelengths are shorter (bunched together) & frequency is higher
Term
 As moving sound moves away from you, how does the detected pitch differ?
Definition
 the detected pitch is lower than the actual pitch because the wavelengths are longer(spread out) & frequency is lower
Term
 Does light require a medium?
Definition
 no
Term
 What are the 3 primary colors of light?
Definition
 red, blue, green
Term
 What are the 3 secondary colors of light? How are secondary colors created?
Definition
 yellow, magenta, cyancreated by mixing 2 primary colors
Term
 What 2 colors of light combine to form yellow?
Definition
 red & green
Term
 What 2 colors of light combine to form magenta?
Definition
 red & blue
Term
 What 2 colors of light combine to form cyan?
Definition
 green & blue
Term
 Define complimentary colors? What are the complimentary colors of light?
Definition
 2 colors that combine to make white lightyellow & blue, cyan & red, magenta & green
Term
 What are the primary pigment colors?
Definition
 yellow, cyan, magenta
Term
 How do polarization lenses work?
Definition
 they only allow a single plane of light through
Term
 How can the Doppler Effect be related to light?
Definition
 red shift: wavelengths are spread out, frequency is lower, red light is detectedblue shift: wavelengths are bunched together and shorter, frequency is higher, blue color is detected
Term
 How can the Doppler Effect be used as proof of the big bang theory?
Definition
 star that emit light are giving off red light, means they are moving away from us, frequency is lower because wavelengths are longer
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