doubling the mass of a simple pendulum undergoing small oscillations does what to the period of the pendulum
nothing
what dictates the frequency of a sound wave
source of the sound
what determines the speed of a wave
the medium of transmission
a skipper on a boat notices wave crests passing his anchor chain every 5 seconds. if the wave crests are 15m apart what is the speed of the water waves?
3m/2
for a medium transmitting a longitudinal wave the areas of the medium is temporarily increased are called
compressions
when you move away from a fixed sound the frequency of the sound you hear
is less than what the source emits
sonic booms from a plane are produced
by the plane traveling faster than the speed of sound
the three characteristics of a musical tone are loudness quality and timbre
false
the quality of a musical note can be changed by simply playing the note on a different instrument
true
if the note middle c has a pitch of 262 vibrations per second, its second overtone on a vibrating string has a frequency of
786
the wavelength of a fundamental vibration on a 1m long string is half as long as the wavelength of the fundamental vibration in a closed organ pipe of 1m length
true
the ear can hear "fourier analyze" a sound wave but the eye cannot "fourier analyze" a light wave
true
if the fundamental frequency of a violin string is 440Hz what is the frequency in Hz of the first overtone
880
frequencies of sound that are too high for the human ear to hear are called
ultrasonic
the bending of sound through air of uneven temperature is called
refraction
lightning is seen then 10 seconds later is heard. approximately how far in feet is the thunder cloud?
10,500
a 250 Hz tuning fork and a 260Hz tuning fork are vibrating near each other. how many beats per second are heard?
10 (difference of frequency)
which of the following are NOT true concerning the metal rod that vibrated in class by stroking its length
the lowest frequency had a wavelength (in the rod) equal to the length of the rod
sine curve
a wave form traced by simple harmonic motion
Amplitude
the distance of maximum displacement from the equilibrium position
Wave length
the distance between successive crests
Frequency
the number of vibrations per unit time; measured in Hertz
Period
the time required for one vibration
Wave speed
the speed with which a wave passes a stationary point
Transverse wave
a wave in which the medium moves perpendicular to the direction in which the wave travels
Longitudinal wave
a wave in which the medium moves parallel to the direction in which the wave travels
Interference pattern
a pattern formed by the addition of two waves
Standing wave
a stationary wave pattern formed when identical waves pass through a medium in opposite directions
Doppler effect
the change in frequency of a wave due to the motion of the sender or receiver
Bow wave
a V-shaped wave behind a boat that forms when the boat travels faster than the speed of water waves
Shock wave
a cone-shaped wave behind a plane that forms when the plane travels faster than the speed of sound
Sonic boom
the loud (boom-boom) sound resulting from a shock wave hitting your ear
Hertz
the SI unit of frequency
Speed of Sound
depends only on the medium; for air the speed of sound is 340 m/s=760 miles/hour = Mach 1
Infrasonic
sound waves with frequencies below 20 Hertz
Audible
sound waves with frequencies between 20 Hertz and 20,000 Hertz
Ultrasonic
sound waves with frequencies greater that 20,000 Hertz
Compression
a condensed region of a medium through which a longitudinal wave travels
Rarefaction
a rarefied region of a medium through which a longitudinal wave travels
Reverberation
the garbled sound that results from multiple reflections of sound waves; re-echoed sound
Refraction
the bending of a wave through a non-uniform medium, caused by difference in wave speeds
Sound waves bend toward
cool air
Natural Frequency
a frequency at which an elastic object naturally tends to vibrate
Resonance
the result of a forced vibration in a body when the applied frequency matches the
Beats
the throbbing sound heard when two slightly different tones are played together
Carrier Wave
a high frequency radio wave that "carries" a sound wave through a process called modulation
Modulation
impressing one wave system (sound wave) upon another of a higher frequency (radio waves)
Pitch
the "highness" or "lowness" of a tone; corresponds to the frequency of a sound
Loudness
the physical sensation directly related to the sound intensity; measured in decibels
Quality
the characteristic of a sound that allows us to distinguish between the same tone
Partial Tone
one of the frequencies present in a complex tone
Fundamental Frequency
the lowest frequency of vibration; the first harmonic
Harmonic
a partial tone that is and integer multiple of the fundamental
Quality is governed by
the number and relative amplitudes of partial tones
Musical Scale
a succession of notes of frequencies that are in simple ratios to one another
do copmpressions and rarefractions in a sound wave travel in the same directions or in opposite directions
same direction
how fast does sound travel
340m/s
gusts of wind make millis tower sway back and forth completing a cycle in 10s what is the frequency and its period
frequency is 1/10 Hz and period is 10s
if a water wave oscillates up and down 3 times each second and the distance btwn the wave crests is 2m what is the frequency? what is its wavelength? what is the wave speed?
f=3Hz wavelength= 2m wave speed= 6 (wave speed= frequency x wavelength)
longer wavelength means
lower frequency