121 terms

# Physics Review

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Which of the following is not an example of approximate simple harmonic motion ?
a ball bouncing on the floor
Vibrations of an object about an equilibrium point is called simple harmonic motion when the restoring force is proportional to
displacement
Tripling the displacement from equilibrium of an object in simple harmonic motion will change the magnitude of the object's maximum acceleration by what factor ?
3
A mass attached to a spring vibrates back and forth. At maximum displacement, the spring force and the
acceleration reach a maximum
A simple pendulum swings in simple harmonic motion. At maximum displacement,
the acceleration reaches a maximum
A mass attached to a spring vibrates back and forth. At the equilibrium position, the
velocity reaches a maximum
A mass-spring system can oscillate with simple harmonic motion because a compressed or stretched spring has which kind of energy ?
elastic potential
The angle between the string of a pendulum at its equilibrium position and at its maximum displacement is the pendulum's
amplitude
For a mass hanging from a spring. the maximum displacement the spring is stretched or compressed from its equilibrium position is the system's
amplitude
A pendulum swings through a total of 28. If the displacement is equal on each side of the equilibrium position what is the amplitude of this vibration?
14
The Doppler effect occurs with
all waves
If you are on a train, how will the pitch of the train's whistle sound to you as the train moves?
the pitch will not change
The property of sound called intensity is proportional to the rate at which energy flows through
an area perpendicular to the direction of propagation
At a distance of 3m, the intensity of a sound will be __ the intensity it was at a distance of 1m.
one-ninth
The intensity of a sound at any distance from the source is directly proportional to the sound's
power
If the intensity of a sound is increased by a factor of 100, the now decibel level will increase
by 20 units
The perceived loudness of a sound is measured in
decibels
Which of the following decibels levels is nearest to the value that you would expect for a running vacuum cleaner ?
70dB
A sound twice the intensity of the faintest audible sound is not perceived as twice as loud because the sound of loudness in human hearing
is approximately logarithmic
When the frequency of a force applied to a system matches the natural frequency of vibration of the system's __ occurs
resonance
The Tacoma Narrow bridge collapsed 1940 when winds caused __to build up in the bridge.
a standing wave
For a standing wave in an air column in a pipe that is open at both ends, there must be at least
two antinodes and one node
When an air column vibrates in a pipe that is open at both ends,
all harmonics are present
When an air column vibrates in a pipe that is closed at one end,
only odd harmonics are present
If a guitar string has a fundamental frequency of 500Hz, what is the frequency of its second harmonic?
1000 Hz
The wavelength of the fundamental frequency of a vibrating string of length L is,
2L
The quality of a musical tone of a certain pitch results from a combination of
harmonics
Musical instruments of different types playing the same note may often be identified by the __ of their sound
timbre
How many beats per second are heard when two vibrating tuning forks having frequencies of 342Hz & 345Hz are held side by side ?
3 Hz
How many beats per second are heard when two vibrating tuning forks having frequencies of 216Hz & 224Hz are held side by side ?
8Hz
A vibrating guitar string emits a tone just as a 5.00x10^2 Hz tuning fork is struck. If five beats per second are heard, which of the following is a possible frequency of vibration of the string?
495Hz
Four beats per second are heard when two notes are sounded. The frequency of one is 420Hz. Which of the following is a possible frequency of the other note?
416Hz
Audible beats are formed by the interference of two waves
of slightly, different frequencies
Two violin players tuning their instruments together hear 8 beats in 2s. What is the frequency difference between the two violins?
4Hz
Sound waves
are longitudinal waves
The trough of the sine curve used to represent a sound wave corresponds to
the amplitude
Which of the following is the region of a sound wave in which the density and pressure are greater than normal ?
compression
The highness or lowness of a sound is perceived as
pitch
Pitch depends on the __ of a sound wave
Frequency
Of the following materials, sound waves travel fastest through
copper at 0^C
In general, sound travels faster through
solids than through gases
At a large distance from a sound source, spherical wave fronts are viewed as
plane waves
The point at which a ray crosses a wave from corresponds to a __ of a sound wave
compression
The distance between wave fronts of plane waves corresponds to __ of a sound wave
one wavelength
A train moves down the track toward an observer. The sound from the train, as heard by the observer, is__ the sound heard by a passenger on the train
higher in pitch than
Part of a pencil that is placed in a glass of water appears bent in relation to the part of the pencil that extends out of the water. What is the phenomenon called?
refraction
Refraction is the bending of a wave disturbance as it passes at an angle from one __ into another
medium
Which is an example of refraction?
A fish appears closer to the surface of the water than it really is when observed from a riverbank
The __ of light can change when light is refracted because the medium changes.
wavelength
The __ of light can change when light is refracted because the velocity changes.
wavelength
Light is not refracted when it is
striking a wood surface at and angle of 75
When light passes at an angle to the normal from one material into another material in which its speed is higher,
it is bent away from the normal to the surface
When light passes at an angle to the normal from one material into another material in which its speed is lower,
it is bent toward the normal to the surface
When a light ray moves from air into glass, which had a higher index of refraction, its path is
bent toward the normal
When a light ray passes from water into diamond at an angle of 45, it's path is
bent toward the normal
The relationship between frequency, wavelength, and speed holds for light waves because
all forms of electromagnetic radiation travel at a single speed in a vacum
The farther light is from a source
the more spread out light becomes
If you are reading a book and you move twice as far away from the light source, how does the brightness at the new distance compare with that at the old distance? It is
one-fourth as bright
Snow reflects almost all of the light incident upon it. However, a single beam of light is not reflected in the form of parallel rays. This is an example of __ reflection off a __ surface.
diffuse, rough
A highly polished finish on a new car provides a __ surface for __ reflection.
smooth, specular
When incoming rays of light strike a flat mirror at an angle close to the surface of the mirror, the reflected rays are
close to the mirror's surface
When a straight line is drawn perpendicular to a flat mirror at the point where an incoming ray strikes the mirror's surface, the angle of incidence and reflection are measured from the normal and
the angles of incidence and reflection are equal
If a light ray strikes a flat mirror at an angle of 27 from the normal, the reflected ray will be
27 from the normal
If a light ray strikes a flat mirror at an angle of 14 from the normal, the reflected ray will be
14 from the normal
If a light ray strikes a flat mirror at an angle of 29 from the normal, the reflected ray will be
29 from the normal
If a light ray strikes a flat mirror at an angle of 30 from the normal, the reflected ray will be reflected at an angle
60 from the mirror's surface
The image of an object in a flat mirror is always
the same size as the object
When two parallel mirrors are placed so that their reflective sides face each other, __ images form. This is because the image in one mirror becomes the __ for the other mirror.
multiple, object
If you stand 3.0 m in front of a flat mirror, how far away from you would your image be in the mirror?
6.0m
Which of the following best describes the image produced by a flat mirror?
virtual, upright, and magnification equal to one
When the reflection of an object is seen in a flat mirror, the distance from the mirror to the image depends on
the distance from the object to the mirror
What type of mirror is used whenever a magnified image of an object is needed?
convex mirror
The mirror equation and ray diagrams are valid concepts only for what type of rays?
paraxial rays
Object distance, image distance, and radius of curvature are __ for curved mirrors
interdependent
For a spherical mirror, the focal length is equal to __ the radius of curvature of the mirror
one-half
A concave mirror with a focal length of 10.0cm creates a real image 30.0cm away on its principal axis. How far from the mirror is the corresponding object?
15cm
A concave mirror forms a real image at 25.0cm from the mirror surface along the principal axis. If the corresponding object is at a 10.0cm distance, what is the mirror's focal length?
7.14cm
An object is 29 cm away from a concave mirror's surface along the principle axis. If the mirror's focal length is 9.50 cm, how far away is the corresponding image?
14cm
If a virtual image is formed 10.0 cm along the principal axis from a convex mirror with a focal length of -15.0cm what is the object's distance from the mirror?
30cm
A convex mirror with a focal length of -20.0cm had an object 30.0cm in front on the mirror. What is the value of q for the corresponding image?
-12cm
A mirror has an object located on its principal axis 40.0cm from the mirror's surface. A virtual image is formed 15.0cm behind the mirror. What is the mirror's focal length?
-24.0cm
In the diagram shown above, the image of object B would be :
__^A________;F___^B_____)
virtual,enlarged, and upright
In the diagram shown above , the image of object B would be :
___^A________;F___^B____(
virtual,reduced, and upright
Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal-point distance from the mirror?
real, inverted, and magnification greater than one
Which portion of the electromagnetic spectrum is used in a television?
Which portion of the electromagnetic spectrum is used in a microscope?
visible light
Which portion of the electromagnetic spectrum is used to identify fluorescent minerals?
ultraviolet light
What is the wavelength of microwaves of 3.0x10^p Hz frequency?
0.10m
What is the frequency of infrared light of 1.0x10^-4m wavelength ?
3.0x10^12 Hz
What is the frequency of an electromagnetic wave with a wavelength of 1.0x10^5m?
3.0x10^3 Hz
What is the wavelength of an infrared wave with a frequency of 4.2x10^14Hz?
7.1x10^-7m
In a vacuum, electromagnetic radiation of short wavelengths
travel as fast as radiation of long wavelengths
When red light is compared with violet light,
both travel at the same speed
If you know the wavelength of any form of electromagnetic radiation , you can determine its frequency because
all wavelengths travel at the same speed
Two waves traveling in opposite directions on a rope meet and undergo complete destruction interference. Which of the following best describes the waves a moment after the waves meet and coincide ?
The waves continue uncharged
When two mechanical waves coincide, the amplitude of the resultant wave is always __ the amplitude of each wave alone.
the sum of
Two mechanical waves that have positive displacements from the equilibrium position and coincide. What kind of interference occurs?
constructive
Two mechanical waves meet and coincide. One had a positive displacement from the equilibrium position and the other wave has a negative displacement. What kind of interference occurs?
destructive
Which of the following types of interference will occur when the pulses in the figure above meet ? (2 humps up )
constructive interference
Which of the following types of interference will occur when the pulses in the figure above meet ? (1hump up 1 down)
destructive interference
A child on a playground swings through a total of 32. If the displacement is equal on each side of the equilibrium position, what is the amplitude of this vibration>
16
For a system in simple harmonic motion, which of the following is the time required to complete a cycle of motion?
period
For a system in simple harmonic motion, which of the following is the number of cycles or vibrations per unit of time ?
frequency
How are frequency and period related in simple harmonic motion ?
they are inversely related
If a pendulum is adjusted so that its frequency changes from 10Hz to 20Hz, its period will change from n seconds to
n/2 seconds
By what factor should the length of a simple pendulum be changed in order to triple the period of vibration?
9
Which of the following features of a given pendulum changes when the pendulum is moved from Earth's surface to the moon?
the restoring force
A wave travels through a medium. As the wave passes, the particles of the medium vibrate in a direction perpendicular to the direction of the wave's motion. The wave is
transverse
Which of the following is a single nonperiodic disturbance?
pulse wave
One end of a taut rope is fixed to a post. What type of wave is produced if the free end is quickly raised and lowered one time ?
pulse wave
In what direction does a parallel ray form an object proceed after passing though a converging lens?
The ray passes through the focal point, F
All of the following images can be formed by a converging, lens except which one ?
real, upright, and magnified
All of the following images can be formed by a converging, lens except which one ?
virtual, inverted, and same size
How many focal points and focal lengths do converging and diverging lenses have?
two, one
The focal length for a converging lens is
always positive
A virtual image has a___ image distance and is located in __ of the lens .
negative, front
The focal length for a diverging lens is
always negative
An object placed 20.0 cm from thin converging lens along the axis of the lens. If a real image forms behind the lens at a distance of 8.00 cm from the lens, what is the focal length of the lens?
5.71
An object placed 14.0 cm from a diverging lens. If a virtual image appears 10.00 cm from the lens on the same side as the object, what is the focal length of the lens?
-34cm
A film projector produces a 1.51m image of a horse on a screen. If the projector lens is 4.00m from the screen and the size of the horse of the film is 1.07cm, what is the magnitude of the magnification of the image?
141
An object that is 18cm from converging lens forms a real image 22.5cm from the lens, what is the magnification of the image?
1.25