Question

science matter and energy 2nd ed. test 7 chapter 7 emma faith cleveland 881427 0 match the terms to their descriptions. use a number - two pencil only. 1. the bending of the path of a wave as a result of a change in speed 2. the spreading out of a wave after it passes through a narrow opening 3. the reinforcement or cancellation that occurs when two or more waves meet 4. the change in frequency caused by an objects motion 5. the multiple reflections causing a persistence of sound 6. the process of dissipating the energy of sound waves in matter a. absorption c. doppler effect e. refraction g. reverberation b. diffraction d. interference f. resonance choose the best answer and fill in the corresponding bubble. 7. which of the following statements is not true? the high point of a wave is the crest, and the low point is the trough. when a wave travels through a medium, the individual particles oscillate but then return to their original position. water waves are longitudinal waves. in transverse waves, the particles of the medium oscillate at right angles to the direction of wave travel. 8. the maximum distance that particles are displaced by a wave is the waves amplitude frequency period wavelength 9. what is the speed of a wave with a wavelength of 5.0 cm and a frequency of 20 hz? 25 cm/s 1m/s 100 m/s 1,000 cm/s 10. in 5.0 s, 1,000 waves pass a given point. what is the frequency of the waves? 0.005 hz 200 hz 2,000 hz 5,000 hz

Explanation:

Step1: Match - term 1

The bending of the path of a wave due to a change in speed is refraction. So 1 - E.

Step2: Match - term 2

The spreading out of a wave after passing through a narrow opening is diffraction. So 2 - B.

Step3: Match - term 3

The reinforcement or cancellation when two or more waves meet is interference. So 3 - D.

Step4: Match - term 4

The change in frequency caused by an object's motion is the Doppler effect. So 4 - C.

Step5: Match - term 5

The multiple reflections causing a persistence of sound is reverberation. So 5 - G.

Step6: Match - term 6

The process of dissipating the energy of sound waves in matter is absorption. So 6 - A.

Step7: Solve question 7

Water waves are a combination of transverse and longitudinal motion, not purely longitudinal. So the false statement is "Water waves are longitudinal waves."

Step8: Solve question 8

The maximum distance that particles are displaced by a wave is the wave's amplitude.

Step9: Solve question 9

Use the wave - speed formula $v = f\lambda$, where $\lambda=5.0\ cm = 0.05\ m$ and $f = 20\ Hz$. Then $v=f\lambda=20\ Hz\times0.05\ m = 1\ m/s=100\ cm/s$.

Step10: Solve question 10

Frequency $f=\frac{n}{t}$, where $n = 1000$ waves and $t = 5.0\ s$. So $f=\frac{1000}{5}=200\ Hz$.

Answer:

1. E. Refraction
2. B. Diffraction
3. D. Interference
4. C. Doppler effect
5. G. Reverberation
6. A. Absorption
7. Water waves are longitudinal waves.
8. amplitude
9. 1m/s
10. 200 Hz