1. the Speed of an Ocean Wave on the Coast Is 5.00 M/S; the Wavelength Is 15.0 Meters

WAVES WS

1.  The speed of an ocean wave on the coast is 5.00 m/s; the wavelength is 15.0 meters. What is the frequency with which the wavefronts hit the beach?

2.  What is the wavelength of a sound emitted by a tuning fork of frequency 440. vibrations per second if the speed of sound in air is 340. m/s?

3.  Radio waves travel at the speed of light, 3.00 x 108 m/s. What is the wavelength of a radio wave from an AM station broadcasting at a frequency of 750. kHz? Compare the wavelength to some familiar object of similar length.

4.  If the speed of sound in air is 340. m/s and wavelength of a sound is 2.00 m, what is the frequency of the sound wave? This sound wave encounters a body of water and transmits into it. What is the frequency of it as it moves through the water?

5.  A sonar generator on a submarine produces periodic sound waves at a frequency of 2.50 MHz. The wavelength of the waves in sea water is 0.480 millimeter. When the generator is directed downward, an echo reflected from the ocean floor is received 16.7 s later. How deep is the ocean at that point?

6.  Starting with the wave shown, sketch the following:

a.  A wave with twice the amplitude.

b.  A wave with twice the frequency.

c.  A wave with twice the wavelength.

7.  If a wave on a drum looks like the diagram, sketch how the wave would look if the drum were hit harder.

8.  A wave travels from one medium to another and the wavelength decreases. What happened to the frequency and speed of the wave?

9.  The pulse below is heading toward a less rigid medium. Sketch the reflected pulse.

10.  The pulses in the 2 ropes below are moving toward each other. Draw sketches to show how the pulses will look when they meet in the middle.

11.  A standing wave in a clothesline has 4 nodes and 3 antinodes. The clothesline is 12.0 meters long and is vibrating at 0.500 Hz. Draw a sketch of this. What is the speed of the wave?

12.  A standing wave is produced in a 4.00-m long stretched string by a 15.0-Hz vibrating source. If the speed of the waves in the string is 12.0 m/s, how many antinodes will exist in the string? Draw a sketch of this.

13.  A guitar string is observed to have four equal loops in a standing wave when driven at a frequency of 420. Hz. Draw a sketch of this. What driving frequency will set up a wave with two equal segments?

14. A long spring passes along the floor of a room and out a door. A pulse is sent along the spring. After a while, an inverted pulse of almost the same amplitude returns along the spring. Is the spring attached to the wall in the next room or is it lying loose on the floor?

15. To obtain waves of a longer wavelength, is wave frequency along a rope increased or decreased?

16. A pulse moves along a heavy spring, as shown. The spring is attached to a light thread that ends at a wall.

a. Describe the behavior of the pulse when it reaches A.

b. Describe the behavior of the transmitted pulse when it reaches B.

17. A pulse is sent along a thread, as shown below. The thread is attached to a heavy rope that ends at a wall.

a. Describe the behavior of the pulse when it reaches boundary A.

b. Describe the behavior of the transmitted pulse when it reaches boundary B.

18. For each of the three diagrams below, the left side of the diagram shows a pulse travelling to the right. The right side of the diagram shows the transmitted and reflected pulses that result after the pulse encounters the boundaries at A, B, and C. Describe the boundaries A, B, and C as being more rigid or less rigid.

19. Distinguish between a mechanical wave and an electromagnetic wave.

20. How do transverse and longitudinal waves differ?

21. If a pulse is sent along a rope, how does the rope behave at any given point after the pulse has passed?

22. Distinguish between the period, wavelength, and frequency of a wave train.

23. What is the equation used to find the speed of a wave?

24. What is the amplitude of a wave and what does it measure?

25. Waves are sent along a rope of fixed length. How can the speed of the waves in the rope be changed?

26. When a wave passes into a new medium, what remains the same? What changes?

27. Identify and describe the three means of changing the direction of a wave.

28. A small boat is bobbing up and down in the water as the wave moves under it. Is this wave transverse or longitudinal? Explain.

29. If you produce a wave in a section of garden hose, the garden hose itself would be called the ______, which is the material through which the wave propagates.

30. Suppose that a long line is formed at a movie theater. Someone in back gives a big push. Everyone moves forward as this "push" moves toward the front. As people regain their balance, they move back. Is this wave transverse or longitudinal? Explain.

31. TRUE/FALSE When an ocean wave hits the shore, the water that lands on the beach traveled the entire

way from the middle of the ocean where the wave started.

32. Use the diagrams to answer the following questions:

a. Which wave has the greatest wavelength?

b. Which wave has the greatest amplitude?

c. Which wave has the greatest frequency?

d. Which wave contains the most energy?

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