Waves Review #1

LCHS

Dr.E

A girl leaves a history classroom and walks 10 meters north to a drinking fountain. Then she turns and walks 30 meters south to an art classroom. What is the girl’s total displacement from the history classroom to the art classroom?

(A) 20 m south (C) 40 m south(B) 20 m north (D) 40 m north

One car travels 40 meters due east in 5.0 seconds, and a second car travels 64 meters due west in 8.0 seconds. During their periods of travel, the cars definitely had the same

(A) average velocity(B) total displacement(C) change in momentum(D) average speed

A student does 60 joules of work pushing a 3.0-kilogram box up the full length of a ramp that is 5.0 meters long. What is the magnitude of the force applied to the box to do this work?

(A) 20 N (B) 15 N (C) 12 N (D) 4.0 N

If the frequency of a periodic wave is doubled, the period of the wave will be

(A) halved (B) doubled(C) quartered(D) quadrupled

How much time does it take light from a flash camera to reach a subject 6.0 meters across a room?

(A) 5.010–9 s(C) 5.010–8 s (B) 2.010–8 s(D) 2.010–7 s

Which wave phenomenon makes it possible for a player to hear the sound from a referee’s whistle in an open field even when standing behind the referee?

(A) diffraction (B) Doppler effect(C) reflection (D) refraction

Two pulses, A and B, travel toward each other along the same rope, as shown below.

When the centers of the two pulses meet at point X, the amplitude at the center of the resultant pulse will be (A) +1 unit (B) +2 units (C) 0 (D) –1 unit

The superposition of two waves traveling in the same medium produces a standing wave pattern if the two waves have

(A) the same frequency, the same amplitude, and travel in the same direction(B) the same frequency, the same amplitude, and travel in opposite directions(C) the same frequency, different amplitudes, and travel in the same direction(D) the same frequency, different amplitudes, and travel in opposite directions

A system consists of an oscillator and a speaker that emits a 1,000-hertz sound wave. A

microphone detects the sound wave 1.00 meter from the speaker.

Which type of wave is emitted by the speaker?

(A) transverse (C) circular(B) longitudinal (D) electromagnetic

A system consists of an oscillator and a speaker that emits a 1,000-hertz sound wave. A microphone detects

the sound wave 1.00 meter from the speaker.

The microphone is moved to a new fixed location 0.50 meter in front of the speaker. Compared to the sound waves detected at the 1.00-meter position, the sound waves detected at the 0.50-meter position have a different

(A) wave speed (C) wavelength(B) frequency (D) amplitude

A system consists of an oscillator and a speaker that emits a 1,000-hertz sound wave. A microphone detects

the sound wave 1.00 meter from the speaker.

The microphone is moved at constant speed from the 0.50-meter position back to its original position 1.00 meter from the speaker. Compared to the 1,000.-hertz frequency emitted by the speaker, the frequency detected by the moving microphone is

(A) lower (B) higher (C) the same

A 10-kilogram block is at rest on a plane inclined at 15° to the horizontal. As the angle of the incline is increased to 30°, the mass of the block will

(A) decrease (B) increase (C) remain the same

If the direction of a moving car changes and its speed remains constant, which quantity must remain the same?

(A) velocity(B) displacement (C) momentum(D) kinetic energy

Two carts are pushed apart by an expanding spring. If the average force on the 1-kilogram cart is 1 newton, what is the average force on the 2-kilogram cart?

(A) 1 N(B) 0.5 N (C) 0.0 N(D) 4 N

A lab cart is loaded with different masses and moved at various velocities. Which diagram shows the cart-mass system with the greatest inertia?

A sled and rider slide down a snow-covered hill that makes an angle of 30° with the horizontal. Which vector best represents the direction of the normal force, F

N, exerted by the hill on the sled?

The diagram below shows two pulses of equal amplitude, A, approaching point P along a uniform string.

When the two pulses meet at P, the vertical displacement of the string will be

(A) A (B) 2A (C) 0 (D) A/2

The energy of a water wave is most closely related to its

(A) frequency (B) wavelength(C) period (D) amplitude

Which form(s) of energy can be transmitted through a vacuum?

(A) light, only (B) sound, only (C) both light and sound (D) neither light nor sound

A tuning fork vibrating in air produces sound waves. These waves are best classified as

(A) transverse, because air molecules are vibrating parallel to the direction of wave motion(B) transverse, because air molecules are vibrating perpendicular to the direction of wave motion(C) longitudinal, because air molecules are vibrating parallel to the direction of wave motion(D) longitudinal, because air molecules are vibrating perpendicular to the direction of wave motion

A student in a band notices that a drum vibrates when another instrument emits a certain frequency note. This phenomenon illustrates

(A) reflection (B) resonance(C) refraction (D) diffraction

Radio waves and gamma rays traveling in space have the same

(A) frequency(B) period (C) wavelength(D) speed

The spreading of a wave into the region behind an obstruction is called

(A) diffraction(B) reflection (C) absorption(D) refraction

The diagram above represents a wave moving toward the right side of this page. Which wave shown below could produce a standing wave with the original wave?

A train sounds a whistle of constant frequency as it leaves the train station. Compared to the sound emitted by the whistle, the sound that the passengers standing on the platform hear has a frequency that is(A) lower, because sound-wave fronts reach the platform at a frequency lower than the frequency at which they are produced(B) lower, because sound waves travel more slowly in the still air above the platform than in the rushing air near the train(C) higher, because sound-wave fronts reach the platform at a frequency higher than the frequency at which they are produced(D) higher, because sound waves travel faster in still air above the platform than in the rushing air near the train

Which type of wave requires a material medium through which to travel?

(A) sound(B) television (C) radio(D) x ray

A periodic wave is produced by a vibrating tuning fork. The amplitude of the wave would be greater if the tuning fork were

(A) struck more softly (B) struck harder (C) replaced by a lower frequency tuning fork (D) replaced by a higher frequency tuning fork

The sound wave produced by a trumpet has a frequency of 440 hertz. What is the distance between successive compressions in this sound wave as it travels through air?

(A) 1.5 × 10–6 m (B) 0.75 m(C) 1.3 m (D) 6.8 × 105 m

The diagram above shows two pulses approaching each other in a uniform medium. Which diagram below best represents the super-position (addition) of the two pulses?

Sound waves strike a glass and cause it to shatter. This phenomenon illustrates

(A) resonance(B) reflection (C) refraction(D) diffraction

Magnetic fields are produced by particles that are

(A) moving and charged(B) moving and neutral(C) stationary and charged(D) stationary and neutral

A longitudinal wave moves to the right through a uniform medium. Points A, B, C, D, and E

represent the positions of particles of the medium.

Which diagram best represents the motion of the particle at position C as the wave moves to the right?

A longitudinal wave moves to the right through a uniform medium.

Points A, B, C, D, and E represent the positions of particles of the medium.

The wavelength of this wave is equal to the distance between points

(A) A and B (B) A and C (C) B and C (D) B and E

The energy of this wave is related to its

(A) amplitude (B) speed(C) period (D) wavelength

Playing a certain musical note on a trumpet causes the spring on the bottom of a nearby snare drum to vibrate. This phenomenon is an example of

(A) resonance(B) refraction (C) reflection(D) diffraction

As viewed from Earth, the light from a star has lower frequencies than the light emitted by the star because the star is

(A) moving toward Earth(B) moving away from Earth(C) stationary

The diagram represents a periodic wave traveling through a uniform medium. If the frequency of the wave is 2.0 hertz, the speed of the wave is

(A) 6.0 m/s (C) 8.0 m/s(B) 2.0 m/s (D) 4.0 m/s

The diagram shows a standing wave in a string clamped at each end. What is the total number of nodes and antinodes in the standing wave?

(A) 3 nodes and 2 antinodes(B) 2 nodes and 3 antinodes (C) 5 nodes and 4 antinodes(D) 4 nodes and 5 antinodes

Approximately how much time does it take light to travel from the Sun to Earth (Sun to Earth distance = 1.5 x 1011 m)?

(A) 2.00 × 10–3 s(B) 1.28 × 100 s (C) 5.00 × 102 s(D) 4.50 × 1019 s

The time required for a wave to complete one full cycle is called the wave’s

(A) frequency(B) period(C) velocity(D) wavelength

The wavelength of the wave is equal to the distance between points

(A) A and G (B) B and F (C) C and E (D) D and F

When a light wave enters a new medium and is refracted, there must be a change in the light wave’s

(A) color (B) frequency (C) period (D) speed

Wave X travels eastward with frequency f and amplitude A. Wave Y, traveling in the same medium, interacts with wave X and produces a standing wave. Which statement about wave Y is correct?(A) Wave Y must have frequency f, an amplitude of

A, and be traveling eastward.(B) Wave Y must have frequency 2f, an amplitude

of 3A, and be traveling eastward.(C) Wave Y must have frequency 3f, an amplitude

of 2A, and be traveling westward.(D) Wave Y must have frequency f, an amplitude of

A, and be traveling westward.

The diagram above represents two pulses approaching each other from opposite directions in the same medium. Which diagram to the right best represents the medium after the pulses have passed through each other?

A car’s horn is producing a sound wave having a constant frequency of 350 hertz. If the car moves toward a stationary observer at constant speed, the frequency of the car’s horn detected by this observer could be

(A) 320 Hz(B) 330 Hz (C) 350 Hz (D) 380 Hz

A transverse wave is traveling to the right through a medium. Point A represents a particle of the medium. In which direction will particle A move in the next instant of time? (A) up (B) down (C) left (D) right

Increasing the amplitude of a sound wave produces a sound with

(A) lower speed(B) higher pitch (C) shorter wavelength(D) greater loudness