127 terms

# Physics 101 Exam 2

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halves
If you double the frequency of a vibrating object, its period
No
Two waves cress are generated at opposite ends of a long rope. Will there be an instant in which the rope's amplitude is zero everywhere?
decrease
As the wavelength of a wave in a uniform medium increases, it its frequency
2 hertz
A floating leaf oscillates up and down two complete cycles each second as a wave passes by. What is the wave's frequency.
3.0 m
The string above 1.5 meters long and is vibrating as the first harmonic (one loop). The string vibrates up and down with 33 complete vibrational cycles in 10 seconds. Determine the wavelength for this wave.
greater speed
Pulling a stretched out slinky tighter will cause a pulse sent down the slinky to have
false
Doubling the frequency of a wave source in a particular medium doubles the speed of the waves.
0.2
A period of 5.0 seconds corresponds to a frequency of _________ Hertz.
sound
not a transverse wave
minimum amplitude
A node is a position of
parallel
In a longitudinal wave, the particles of the medium vibrate or move ________ to the direction the wave is traveling.
None of the above (amplitude, length, frequency)
If waves are going by at the same speed, the wave with the greatest period of oscillation is the wave that has the greatest
2 m/s
As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave?
0.5 hertz
An object that completes 10 vibrations in 20 seconds has a frequency of
1/3 hertz
Two boats are anchored four meters apart. They bob up and down once every three seconds, but when one is up the other is down. There are never any wave crests between the boats. Calculate the frequency of the waves.
6 m/s
A wave travels an average distance of 6 meters in one second. What is the wave's velocity?
10 m/s
A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. The speed of the wave is
not enough information to say
A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is
20 m/s
A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed?
two identical waves moving different directions along the same medium interfere
A standing wave is formed when
remain the same
As a wavelength of a wave in a uniform medium increases, its speed will
1/150 sec
A fly flaps its wings back and forth 150 times each second. The period of a wing flap is
2 cm
A transverse wave is found to have a vertical distance of 4 cm from a trough to a crest, a frequency of 12 Hz, and a horizontal distance of 5 cm from a crest to the nearest trough. Determine the amplitude of this wave.
2 m
The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is
0.5 hertz
A weight suspended from a spring bobs up and down over a distance of one meter in two seconds. Its frequency is
amplitude, frequency, wavelength, and speed
Like a transverse wave, a longitudinal wave has
2 hertz
An object that completes 20 vibrations in 10 seconds has a frequency of
all of the above (sound, light, and water waves)
Wave interference occurs for
12 cm
A transverse wave is found to have a vertical distance of 8cm from a trough to a crest, a frequency of 12 Hz, and a horizontal distance of 6cm from a crest to the nearest trough. Determine the wavelength of this wave
neither
Mr. Wegley attaches a slinky to the wall and begins introducing pulses with different amplitudes. Which of the two pulses below will reach the wall first?
4 cm
A transverse wave is found to have a vertical distance of 8cm from a trough to a crest, a frequency of 12Hz, and a horizontal distance of 6cm from a crest to the nearest trough. Determine the amplitude of this wave
0.5 hertz
A child on a playground swing makes a complete to-and-fro swing each 2 seconds. The frequency of swing is
wave medium
The speed of a wave is a property of the
antinode
Suppose that there was a ride at an amusement park which was titled "The Standing Wave." Which location - node or antinode - on the ride would give the greatest thrill?
1/2 sec
A pendulum makes 40 vibrations in 20 seconds. Calculate its period
the wavelength is halved and the speed remains constant
Dawn and Aram have stretched a slinky between them and begin experimenting with waves. As the frequency of the waves is doubled,
3 m/s
A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 15m. What is the speed of the water waves?
0.2
A period of 5 seconds corresponds to a frequency of __________ Hz
lower frequency
Lupert and his lady-friend Eunice enjoy another warm day at the swimming pool. Lupert and Eunice start splashing the water. If Eunice makes less force and less frequent splashes than Lupert does, the waves she produces have a...
4
About how many octaves are present between 100 hertz and 1600 hertz?
decreases
As the pitch of a sound in air increases, its wavelength
smaller amplitude
Lupert and his lady-friend Eunice enjoy another warm day at the swimming pool. Lupert and Eunice start splashing the water. If Eunice makes less forceful and less frequent splashes than Lupert does, the waves she produces have a...
longer period
Lupert and his lady-friend Eunice enjoy another warm day at the swimming pool. Lupert and Eunice start splashing the water. If Eunice makes less forceful and less frequent splashes than Lupert does, the waves she produces have a...
none of the above-wavelength, speed, amplitude
Double the frequency of sound wave in air and you also double its
decreases
As we become older, the frequency range of human hearing
both air and water
Interference of sound can occur in
with its base against a table top
Sound will be louder if a struck tuning fork is held
lower frequencies because the wavelength increases
Longer air columns produce
0.2 m
What approximate open tube length will resonate best with a sound wave having a wavelength of 0.40 m?
glass armonica
In the 1700s, Ben Franklin invented a musical instrument that was named the
both air and water
Diffraction of sound can occur in
interference
The phenomenon of beats results from sound
lower frequency notes
All other things being the same, strings that are longer than other identical strings will produce
both air and water
Reflection of sound can occur in
0.15 m
What approximate wavelength of sound resonates best with an open tube that is 0.30 m long?
size, shape, and elasticity
The natural frequency of an object depends on its
2/4
A sound wave resonates best in an open tube when the tube length is approximately ____________ of a wavelength long.
higher frequencies because the speed of the wave in the string increases
When plucked, tighter strings produce
vibrating
The source of every sound is something that is
at its natural frequency
The least energy required to produce forced vibration in an object occurs
lower
With open or closed pipe resonance, the longer the tube, the __________ the pitch.
1 m
A 340 Hz sound wave travels at 340 m/s in air with a wavelength of
higher frequency notes
All other things being the same, strings that are stretched more tightly will produce
1059 hertz
Suppose you sound a 1065 Hz tuning fork at the same time you strike a note on the piano and hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What is the frequency of the piano string?
decreases
Repeatedly tap the side of a drinking glass with a spoon while filling it with water and you will notice that the pitch of the sound
true
Sound waves can interfere with another so that no sound results. (true or false)
intensity
The loudness of a sound is most closely related to its
least amount of energy input
Resonance can be looked at as forced vibration with the
solids
Sound generally travels fastest through which materials?
higher the pitch will be
When you blow across bottles partially filled with water, the more water in the bottle, the
amplitude
The loudness of a musical sound is a measure of the sound wave's
2/4
What fraction of a sound wavelength is an open pipe?
lower frequency notes
Strings longer than other identical strings produce
interference
The phenomenon of beats results from sound
7
About how many octaves are between 20 Hz and 2560 Hz?
always in front of the mirror
Real images produced by mirrors
10 degrees
A diver shines light up to the surface of a smooth pond at a 10 degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of
are always located behind mirror
Virtual images produced by mirrors
never
Plane mirror images are __________ enlarged
both (plane and curved mirrors)
The law of reflection holds for
never
Plane mirror images are __________ inverted
0.5 m tall
To see his full height when standing 3m from a plane mirror, a boy that is 1m tall needs a mirror that is at least
1/2 height
The shortest plane mirror in which you can see your entire image is
sometimes
Images formed by concave mirrors are __________ upright
sometimes
Images formed by concave mirrors are __________ inverted
sometimes
Images formed by concave mirrors are __________ enlarged
converging; diverging
Concave mirrors are also called __________ mirrors and convex mirrors are also called __________ mirrors
equal distances from the mirror
Object and image for a plane mirror lie
always
Plane mirror images are ____________ virtual.
never
Plane mirror images are ____________ reduced.
never
Plane mirror images are __________ real.
the same amount of yourself
When you look at yourself in a pocket mirror, and then hold the mirror farther away, you see
never
Images formed by convex mirrors are _____________ inverted.
always
Images formed by convex mirrors are ___________ virtual.
never
Images formed by convex mirrors are ____________ real.
lie in the same plane
The incident light ray, the reflected light ray, and the normal between them
If you walk towards a mirror at a certain speed, the relative speed between you and your image is
always
Plane mirror images are ____________ upright.
sometimes
Images formed by concave mirrors are __________ real.
sometimes
Images formed by concave mirrors are _________ reduced.
never
Plane mirrors are __________ reduced.
4 meters
You wish to photograph the image of your little sister, who is standing 2 meters from a plane mirror. Holding the camera beside her head, you should set the distance for
speed in each medium
Refraction results from differences in light's
the change of direction of light as it passes obliquely from one medium into another
Refraction of light is defined as
vacuum
Light travels fastest in
decreases
As light ray enters water from air, its speed
air
A beam of light travels fastest in
all portions of the wave front slow down at the same time
Light does not refract when it passes from air into water and hits head on because
refracts away from the normal
As light ray enters air from water, it
converging lens
A burning glass used to concentrate sunlight in a tiny spot is a
never
Images formed by diverging lenses are _____ the same size as the object
thinner in the middle than in the edges
Diverging lenses are
sometimes
Images formed by converging lenses are _____ reduced
thicker in the middle than in the edges
Converging lenses are
never
Images formed by diverging lenses are _____ inverted
sometimes
Images formed by converging lenses are _____ real
the speed of light in the medium
Optical density refers to
the speed of light in that object
An object's index of refraction allows us to directly calculate
the same as its angle of incidence from the air into the glass
When light passes through an ordinary window pane, its angle of emergence from the glass back into the air is
away from
When light passes from a medium with a high index of refraction value into a medium with a lower index of refraction value, it will bend ___________ the normal.
diverging lenses
Concave lenses are also known as
at the focal point
Objects infinitely far away are focused by a converging lens
converging
Farsightedness is corrected with a _______________ lens.
wavelength
When light is refracted, there is a change in its
the same speed
Different colors of light travel at different speeds in a transparent medium. In a vacuum, different colors of light travel at
slower
The greater a material's index of refraction, the ____________ light travels through that material.
diverging lens
The type of lens that spreads parallel light is a