Physics chapter 6 waves

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When an oscillator is driven in resonance,

. there is maximum energy transfer

A radar pulse returns 9.0 × 10-4 s after it was sent out and reflected by an object. What is the separation distance of the radar source and the object?

1.4 × 105 m

frequency =

1/period

which of the following sound frequencies could be heard by the human ear

10,000 Hz

a sound of 30dB is how many times louder than the threshold of hearing

1000

A series of ocean waves, each 24.0 m from crest to crest and moving past an observer at a rate of 6.0 waves per second, has what speed?

144 m/s

what is the frequency range of human hearing?

20 Hz - 20 kHz

the ultrasonic region is above the sound frequency of

20khz

to double the loudness or sound intensity a dB difference of_________ is needed

3

how fast do electromagnetic waves travel in a vacuum?

3.00x10^8 m/s

Which of the following sound frequencies lie(s) outside the audible range?

47khz

What is the frequency, in hertz, of a sound wave (v = 340 m/s) with a wavelength of 68 m?

5 Hz

Which of the following sound frequencies lie(s) in the audible range?

5 kHz

Which of the following radiations has the longest wavelength?

Infrared

Light can travel to Earth from a distant star, but sound cannot. Why is this?

Light is an electromagnetic wave, and sound requires a medium.

Which of the following radiations has the greatest frequency?

X-rays

if an astronomical light source were to be moving towards us what would we observe

a blueshift

What is necessary for a jet aircraft to generate a sonic boom?

a jet aircraft with a speed greater than speed of sound in air

Standing waves can be set up in a string when two waves that are

a. of the same frequency and amplitude, but are opposite in direction of travel, meet each other

the energy of a wave is related to the square of which of the following?

amplitude

Wave frequency is inversely proportional to

amplitude. period. wave velocity

a moving observer approaches a stationary sound source what do they hear

an increase in frequency

Resonance occurs when

an object having a certain natural frequency is set in vibration by a second object vibrating at that frequency

What causes waves and how do they propagate?

an originating disturbance, energy is transmitted from one particle to another in a medium as a wave propagates outward

how is electromagnetic spectrum arranged

arranged in sequences of wave frequencies or wavelengths

What does resonance mean in terms of a systems energy?

at resonance frequencies there is a maximum energy transfer to a system

A sound with a frequency of 1000 Hz is in the ______________ region of the sound spectrum.

audible

what is the speed of light in a vacuum

c=3.00 x 10^8 m/s

electromagnetic spectrum

different wavelength regions are given names

The major difference between transverse and longitudinal waves is the

direction of the particle displacement with respect to the direction of wave motion.

light waves are ______ waves

electromagnetic

Wave amplitude is related to

energy

waves involve the propagation of

energy

Wave period is the reciprocal of

frequency

A train sounding its horn is moving toward an observer. The pitch of the horn's sound relative to its normal pitch is

higher

resonace occurs at _____ frequencies

higher

is matter propagated by waves?

in general energy is propagated by waves not matter.

An observer moving toward a stationary sound source hears a(n) ___ _____ in

increase

decibels are used to measure the sound property of

intensity

sound

is a propagation of longitudinal waves through matter

in a vacuum electromagnetic waves travel at the speed of

light

sound waves are _______ waves

longitudinal

what is the distinguishing difference between longitudinal and transverse waves?

longitudinal and transverse waves are are distinguished in terms of a particle motion and wave velocity. they are paralleel in longitudinal waves and perpendicular (90 degrees) in transverse waves

A disturbance in particle motion parallel to the wave velocity is called

longitudinal wave

a wave with particle oscillation parallel to the direction of propagation is

longitudinal wave

amplitude

maximum displacement of any part of wave from its equilibrium position

Are particles in a standing wave really "standing or stationary?

no opposite moving particles continually interfere, but the nodes are the only stationary points

Hertz

one cycle per second

dB

one tenth of a Bel

wave velocity and particle motion are _______ in transverse waves

perpendicular

if a piece of ribbon were tied to a stretched string were carrying a transverse wave , then how is the ribbon observed to oscillate

perpendicular to wave direction

the speed of sound is greatest in

solids

ultrasound

sound waves with frequencies greater than 20,000 Hz

which of the following properties does not change in the Doppler effect

speed

which of the following occurs when a stretched string is shaken at one of its natural frequencies

standing waves,resonance, maximum energy transfer

standing waves

stationary waves

speed of light

sun travels through a vacuum of space before reaching earth

What is the Doppler effect?

the apparent change in frequency of the moving force

when the dB doubles does the sound instantly double?

the dB scale is nonlinear and an increase of 3dB per second doubles sound intensity

frequency

the number of oscillation or cycles that occur in a period of time

longitudinal wave

the particle motion and the wave velocity are parallel to each other

transverse wave

the particle motion is perpendicular

intensity

the rate of sound energy transfer through a given area

period

the time it takes the wave to travel the distance of one wavelength

The Doppler effect is observed only when

there is relative motion between the source of a wave and an observer

How is the frequency and period related

they are inversely related

which of the following has frequencies greater than the visible region in the electromagnetic spectrum

ultraviolet

Light waves travel fastest in

vacuum

For a wave with a constant speed, the smaller the period, the smaller (or shorter) its

wavelength

the distance from one wave crest to an adjacent wave crest is called

wavelength

wave speed is equal to frequency times

wavelength

The region of the electromagnetic spectrum with frequencies just greater than those in the ultraviolet region is the ______________ region.

x rays

The region of the electromagnetic spectrum with wavelengths just less than those in the ultraviolet region is the ______________ region

x rays


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