Presentation on theme: "1. If a fire engine is traveling toward you the Doppler Effect will cause the siren to sound…. Higher not louder."— Presentation transcript:
1 1. If a fire engine is traveling toward you the Doppler Effect will cause the siren to sound…. Higher not louder.
2 2. The wave interaction most important for echolocation is Reflection.
3 3. If two sound waves interfere constructively, you will hear A louder sound.
4 You will hear a sonic boom when A shock wave hits your ears.
5 A technological device that can be used to “see” sound waves is a(n) Oscilloscope.
6 6. Which statement about sound is true. a 6. Which statement about sound is true? a. Air particles travel with sound waves. b. Sound waves can travel through a vacuum. c. Sound waves exist only if someone hears them. d. Air particles vibrate along the path of a sound wave.
7 The speed of a sound depends on the medium through which it travels.
8 8. The complete back-and-forth motion of an object is called a Vibration.
9 9. A disturbance that transmits energy through matter or space is called a Wave.
11 11. Which of the following does NOT happen to air particles as a sound wave travels through air? A. They vibrate in place.b. They form compressions.c. They travel with the sound wave.d. They form rarefactions.
12 12. How far does sound travel in 2.5 seconds through oak wood at 20°C?
13 Speed of Sound in Different Media at 20°C Medium Speed Air 343 Helium ,005Water ,482Sea Water ,522Wood (oak) ,850Glass ,540Steel ,20013. How long does it take for sound to travel 3,044 m through sea water at 20°C?
14 Sounds with frequencies that are lower than 20 Hz are called infrasonic.
15 15. ____ is used to check development of an unborn baby inside a mother's body. Ultrasonography
16 17. Constructive interference occurs when a. the rarefactions of one wave overlap the rarefactions of another wave.b. the compressions of one wave overlap the rarefactions of another wave.c. the compressions of one wave overlap the compressions of another wave.d. Both (a) and (c)
17 18. When destructive interference occurs, a sound will be a. louder because the amplitude is increased.b. louder because the amplitude is decreased.c. softer because the amplitude is increased.d. softer because the amplitude is decreased.
18 ____ is the bending of waves around barriers or through openings. a. Resonance c. Echolocationb. Diffraction d. Reflection
19 ____ occurs when an object vibrating at or near a certain frequency causes a second object to vibratea. Resonance c. Echolocationb. Diffraction d. Reflection
20 21. The diagrams illustrate the bending of sound waves through openings, which is called a. refraction c. diffraction.b. reflection d. interference.
21 22. Which diagram illustrates high-frequency sound waves moving from one room into another through a door?a. A c. Both (a) and (b)b. B d. Neither (a) nor (b)
22 Diagram B best illustrates that ____ when you are in the next room. a. high pitches are easier to hearb. low pitches are harder to hearc. high pitches are harder to heard. low pitches are easier to hear
23 During the show, you notice that you see the lights of the fireworks before you hear the explosive sounds. This happens because the speed of. light is faster than the speed of sound in air.
24 Sound that includes a random mix of pitches is called noise
51 Newton's second law of motion states that an object's acceleration a. increases as its mass decreases and as the force acting on it increases.b. decreases as its mass decreases and as the force acting on it increases.c. increases as its mass increases and as the force acting on it increases.d. decreases as its mass increases and as the force acting on it increases.
52 Use Newton's second law of motion to calculate the acceleration of a 7 kg mass if a force of 68.6 N acts on it?
53 How much force is needed to accelerate a 70 kg rider and her 200 kg motor scooter at 4 m/s/s?
54 Newton's third law of motion states that whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
55 Which of the following is NOT an example of Newton's third law of motion? a. hitting a baseball with a batb. an apple falling from a treec. sitting in a chaird. none of the above
56 Inertia is used when explaining Newton's first law of motion.
58 Terminal velocity a. is a constant velocity. b. is a result of air resistance.c. has a balanced net force.d. All of the above
59 Using Newton's second law of motion, what is a skater's acceleration when a 50 kg skater pushes off from a wall with a force of 200 N? a. 1/4 m/s/s c. 50 m/s/sb. 4 m/s/s d. 10,000 m/s/s
60 Use the diagram to answer the following question Use the diagram to answer the following question. The arrows below show forces acting on an object. What is the net force on the object and in what direction would the object move?
61 The distance between two charges is represented by “d” The distance between two charges is represented by “d”. What diagram shows the greatest attractive force between the two charged objects?
62 A horse is walking at a constant speed of 2 m/s A horse is walking at a constant speed of 2 m/s. How far will the horse travel in thirty minutes?
63 A car is traveling at a constant speed of 5 m/s A car is traveling at a constant speed of 5 m/s. How far will the car travel in ten minutes?
64 A girl riding on a skateboard at 3 m/s suddenly hits the curb A girl riding on a skateboard at 3 m/s suddenly hits the curb. The girl will fall a. backward with a speed greater than 3 m/s.b. forward with a speed greater than 3 m/s.c. backward at a speed equal to 3 m/s.d. forward at a speed equal to 3 m/s.
65 Which statement best describes the process of science? a. Scientists are objective and free of prejudice.b. Scientists generally discover new ideas without the help of others.c. Scientific ideas evolve or change over time.d. New ideas in science generally result from planned experiments.
66 A student wants to test how music affects plant growth A student wants to test how music affects plant growth. He grows some plants in a bedroom window with music playing twenty-four hours per day. He grows a different variety of plants in his backyard with no music playing. What is the main problem with the design of this investigation?There is more than one variable in the experiment.
67 When investigating a new cancer-fighting drug, medical researchers give some of the subjects a pill that contains the drug. Some of the other subjects are given a pill that does not contain the drug. The drug-free pill serves what purpose in the design of the investigation? A control.
68 68. Draw and label a longitudinal and a transverse wave 68. Draw and label a longitudinal and a transverse wave. Label the wave length, crest, trough, amplitude, compression, and rarefaction on the appropriate wave.