Physics Quiz Ch 5

In the wave model of an x-ray, two transverse waves are positioned:

perpendicular to each other

An ultrasound machine determines the location of a particular body structure by:

the time it takes for the reflected sound wave to return

The frequency of the second hand of a clock is:

1/60 hertz

Surrounding every moving electron is:

a magnetic field

an electric field

a nuclear field

both a and b

none of these

both a and b

One cycle per second is the definition for the unit:

hertz

A compressional wave has its amplitude or "strength" measured:

in the same direction as the motion of the wave

Microwaves travel through water at a speed of 2.25 X 108 meters per second. If the

microwaves have a frequency of 3 X 1010 hertz, what is their wavelength in water?

0.75 X 10-2

A gamma ray is:

a photon

Sounds inaudible to humans, above 20,000 hertz frequency, are called:

ultrasonic

As a sound wave expands, its:

amplitude and energy decrease by inverse proportion to the square of the distance

In the diagram below, what is the wavelength of this wave?

3 cm

In the diagram above, how fast does this wave travel through its medium?

1.5 cm/sec

Which of the following terms best describes the partial reduction of the x-ray beam as it

passes through matter:

attenuation

In air, sound is a series of:

compressional waves

compressions and expansions of the air molecules

pressure changes above and below normal

all of these

none of these

all of these

Plank's constant times the speed of light is 12.4 when solving for wavelength in angstroms

from energy in kilovolts. If the very shortest wavelength in an x-ray beam is 0.11

angstroms, what is the kVp of this x-ray beam?

113 kvp

In magnetic resonance imaging, the image is produced by detecting emitted from the

patient's body:

radio signals

Microwave ovens produce electromagnetic waves with wavelengths longer than those of

visible light. If a particular microwave has a frequency of 4 X 1010 Hertz, what is its

wavelength?

7.5 millimeters

X-rays have higher-energy photons than visible light because:

they have higher frequency than light

All of the following are required to produce a laser beam except:

a piezoelectric transducer

a medium

a resonant cavity

a power source

a piezoelectric transducer

When explained as a wave, an x-ray is most accurately described as a(n):

double transverse wave

Plank's constant times the speed of light is 12.4 when solving for wavelength in angstroms

from energy in kilovolts. If a single x-ray within the beam has an energy of 65 kilovolts

(kV), its wavelength must be:

0.19 angstroms

The suspicions of French physicist Louis de Broglie, that electrons might sometimes act as

waves, were experimentally confirmed when it was found that streams of electrons could

produce:

interference patterns

Diagnostic x-ray wavelengths range from:

one-tenth to one-half angstrom

In the absence of any current, as a series of waves moves through water, a particular molecule of water will:

oscillate up and down, but not move horizontally

A wave travels 6 meters each second. The air it travels through compresses

and expands two times each second. What is the sound's frequency?

2 Hz

The amplitude of a series of water waves is the:

one-half the vertical distance from crest to trough

An echo is the

reflection of sound from a smooth interface

The source of all electromagnetic waves is:

vibrating electrical charges

By synchronizing light waves so that all their wavelengths peak and trough together in phase,

we obtain:

frequency modulation

Which of the following describes a single unit of light or x-rays:

a quantum

An MRI unit determines the location of a particular body structure by:

varying the magnetic field strength to emit radio waves with different frequencies

The photoelectric effect, described by Albert Einstein, demonstrated that because of their very high energy, x-rays usually act more like:

particles

The wave formula states that the speed of any wave can be found by:

multiplying the number of crests that pass per second by the length of each wave from crest to crest

Which of the following is not part of the electromagnetic spectrum:

-radio waves

-microwaves

-cosmic waves

-gamma rays

-ultrasound waves

ultrasound waves

The formula which relates photon energy and wavelength through Plank's constant is:

E=hf

Which of the following is not true: In outer space, an electromagnetic wave:

cannot travel through the vacuum of space

Which of the following is not a process related to the interaction of x-rays within the body of a patient?

refraction

Which of the following has its wavelengths measured in miles or kilometers?

radio waves

Light that changes direction when passing from air through an interface into water is:

refracted

Microwave ovens produce electromagnetic waves with wavelengths longer than those of

visible light. If a particular microwave has a frequency of 4 X 1010 Hertz, what is its

wavelength?

7.5 millimeters

An MRI unit determines the location of a particular body structure by:

varying the magnetic field strength to emit radio waves with different frequencies

The energy of an x-ray photon is directly proportional to its:

frequency

In MRI, in order for radio waves transmitted into the patient's body to "knock over" protons,

these waves must have their frequency "tuned" so as to resonate with the of the

protons:

precession

Different colors of light are electromagnetic waves with different:

wavelengths

Which of the following has its wavelengths measured in miles or kilometers?

radio waves

A higher-frequency sound wave will travel through air:

at the same speed as a low-frequency sound

When a particular object or molecule has a natural frequency that matches or is a multiple of

the frequency of a sound wave or electromagnetic wave striking it, it will absorb the

wave's energy. This principle is called:

resonance

Which of the following is not part of the electromagnetic spectrum:

ultrasound waves

light that changes direction when passing from air through an interface into water is:

refracted

Radiography is made possible because part of the x-ray beam makes it through the body and

part of it does not. This is referred to as of the x-ray beam:

attenuation

When considering electromagnetic waves, the higher the frequency, the:

shorter the wavelength

The law of reflection states that the angle of incidence of a light ray striking a reflective surface is:

equal to the angle of reflection

All waves transport:

energy

Read carefully: A wave travels 6 meters each second. The air it travels through compresses and expands two times each second. What is the sound's frequency?

2 hertz

For a water wave traveling at 3 meters per second, and 8 = 2 meters, the frequency is:

1.5 hertz

All of the following are correct statements about the medical applications of lasers except:

In CR readers, they are used to scan through a PSP plate to strike a PM tube

In the "corpuscular" model of x-rays, they are imagined to be:

small bundles or blobs of energy with an associated wavelength

In magnetic resonance imaging, the image is produced by detecting emitted from the

patient's body:

radio signals