Chapter 7

1.

1 point

Beats demonstrate that

sound is a wave

sound bounces

sound bends

sound spreads

2.

1 point

Thunderclouds tend to rise until

they reach air that is colder than they are

they reach air that is warmer than they are

they rain out all their water

hit the carbon dioxide layer

3.

1 point

The speed of sound in air

increases as air temperature increases

is always the same

increases if you shout louder

depends on frequency

4.

1 point

The fastest earthquake wave is the

S wave

p wave

all travel in the same speed

L wave

5.

1 point

When there is an atmospheric inversion, sound tends to

bend downward

become absorbed

bends upwards

becomes focused

6.

1 point

SOFAR took advantage of

the uncertainty principle

the sound channel in the ocean

the sound channel in the atmostphere

the magnetic field of the earth

7.

1 point

To have a sound channel, there must be

decrease of the velocity with depth

increase of the velocity with depth

a minimum in the velocity of sound

a maximum in the velocity of sound

8.

1 point

The velocity of sound is approximately

5 miles per second

186,231 miles per second

300m per second

1 miles per second

9.

1 point

The same note is played on two pianos. Beats are heard once per second. From this, we deuce that

the pianos are accurately tuned

both pianos are out of tune

at least one of the pianos is out if tune (the notes are at the wrong frequency)

pianos will sound especially pleasant if played together

10.

1 point

Because of evaporation, the air above the surface of a lake becomes cool. Sound in the air above the lake will tend to

go alternatively up and down

bend upward toward the surface

bend downward toward the surface

go in a straight line parallel to surface

11.

1 point

You feel the tremors of an earthquake. Ten seconds later, you feel another shaking. The distance to the epicenter is about

10 miles

50 miles (80km)

5 miles

2 miles

12.

1 point

As you move to a high altitude, the temperature of the air

first gets cooler, then warmer

first gets warmer, then cooler

stays constant, then gets cooler

13.

1 point

The L wave is often the most damaging because

S and P waves carry too little energy

it moves slowest, so it has the greatest energy per mile

it stays on the surface, so it doesn't spread out very much

it arrives first, before people have the chance to take cover

14.

1 point

Whales and fiber optics both make use of what principle?

Huygens

moore

curie

Heisenberg

15.

1 point

Sound travels fastest in

air

rock

water

vacuum

16.

1 point

Sound tends to bend toward the side with

less dense air

denser air

warmer air

colder air

17.

1 point

As you travel deeper into the ocean, the water temperature

increases with depth

decreases with depth

first gets colder, then gets warmer

does not change with depth

18.

1 point

When two different waves pass through an opening of the same size, which one will spread more?

higher frequency

smaller wavelength

lower frequency

larger wavelength

19.

1 point

When an earthquake at sea starts a tsunami or tidal wave, the initial heigh is relatively small. What accounts for the towering wave that breaks near the shore?

Depth increases

The waves move slower

The waves move faster

wave builds up energy as it moves

wavelength increases

20.

1 point

You are more likely to hear the distant sounds when

the air near the ground is warm and the air above it is cool

the air near the ground is cool and the air above it is also cool

the air near the ground is cool and the air above it is warm

21.

1 point

The ocean sound channel

is very noisy

is very quiet

is radioactive

focuses earthquakes

22.

1 point

The ozone layer is created by

lightning

sunlight

chlorofluorocarbons

Co2

23.

1 point

According to this text, the flying disks that crashed near Roswell were

alien flying saucers

microphones

U-2 airplanes

advanced US space vehicles

24.

1 point

Which of the following statements was true about Project Mogul?

involved the invention of integrated circuits

it was concerned with the atmosphere

it led to discovery of nuclear fission

it resulted in the first nuclear bomb

25.

1 point

An octave refers to two frequencies that differ by a factor of

1.5

8

2

sqrt(2)

26.

1 point

when an opening gets smaller, a wave that passes through it

spreads more

stays the same

changes its wavelength

spreads less

27.

1 point

The slowest earthquake wave is the

L wave

all travel in the same speed

P wave

S wave

28.

1 point

A water wave has a wavelength of 10 meters and a frequency of 2 cycles/sec. Its velocity is

20 meters per second

10 meters per second

50 meters per second

2 meters per second

29.

1 point

A magnitude 9 earthquake, compared to a magnitude 8 earthquake

velocity 2X faster

has 10 to 30 times more energy

has a velocity to to 30 X faster

twice the energy

30.

1 point

The very center of the earth is

solid iron

pure rock

liquid rock

liquid iron

31.

1 point

Landfill is dangerous because

the amplitude of the earthquake increases

the frequency of an earthquake increases

tend to focus earthquake energy

the wavelength of an earthquake increases

32.

1 point

SOSUS refers to

a system for detecting submarines

a project to detect nuclear explosions

method of rescuing pilots designed during WWII

a system using many artificial earth satellites

33.

1 point

If we double the frequency of sound, the wavelength is

quadrupled

unchanged

halved

doubled

34.

1 point

which of kind of earthquake wave is purely longitudinal?

S wave

P wave

they are all longitudinal

L wave

35.

1 point

The atmosphere sound channel would not exist if not for

ultraviolet light

carbon dioxide

thunderstorms

IR light

36.

1 point

When two different waves pass through an opening of the same size, which one will spread more?

higher frequency

smaller wavelength

larger wavelength

lower frequency

37.

1 point

The atmospheric sound channel is created because of

ultraviolet light

conduction

conveection

carbon dioxide

38.

1 point

We know that the inner part of the Earth is liquid because

no S waves move across it

at such great pressures everything becomes liquid

neutrinos pass through it and show the pattern

we can detect the flow of material from the emitted sound

39.

1 point

the sound channel in the ocean carries sound a long distance because

the pressure of the ocean at that depth makes sound louder

the sound doesn't spread out in the up or down directions

the ocean doesn't absorb sound at that level

whales listen to the sound and sing it again, increasing its volume

40.

1 point

Water waves are

pure longitudinal waves

compressional

pure transverse waves

both transverse and longitudinal

41.

1 point

You can measure the distance to the epicenter by measuring

amplitude of P wave

amplitude of S wave

the time between the P and S wave

frequency of L wave

42.

1 point

The sound from passing car sounds like high pitch, but as it passes, it gets lower. That's an example of

the Doppler shift

wave cancellation

Huygens principle

the Ewing principle

43.

1 point

Sound waves are

transverse

rotational

combination of transverse and compressional

compression (longitudinal)

44.

1 point

Beats measure

freuqnecy

the difference between two frequencies

loudness

presence of noise

45.

1 point

Which of the following statements are true about earthquakes

P waves are fastest, and L waves cause the most destruction

L wave are slowest, and P wave causes most destruction

S waves are fastest and cause most destruction

P waves are fastest and cause the most destruction

46.

1 point

A pianist plays two keys: middle C, and the C above middle C (i.e. an octave higher). The speed of sound for the higher frequency, compared to that for the lower frequency, is (careful, this may be a trick question)

2 x faster

the same

sqrt(2) faster

2x slower

47.

1 point

An earthquake wave does its worst damage when it reaches an area that

adds additional energy

decreases its frequency

increases its frequency

slows down

48.

1 point

On a typical day, sound emitted near the ground tends to bend

not at all, goes straight

downwards towards the ground

upward, toward the sky

49.

1 point

wave tend to bend in to the side

upwards

downwards

higher wave velocity

with slower wave velocity

50.

1 point

Very long wavelength water waves

travel slower than short ones

travel fsame speed as short ones

travel faster than short ones

travel faster if they have high amplitude and slower if they have low amplitude