Multiple Choice, Fill-in-the-Blank, and Short Answer (40 points toal) A. Multipl

Question

Multiple Choice, Fill-in-the-Blank, and Short Answer (40 points toal) A. Multiple Choice. Choose the best answer and place the letter on the line next to the question. (16 pts) D1. Which sound is twice as loud as a 20 dB sound? A) 40 dB B) 30 dB C) 60 dB D) 25 dB 2. A hole is cut out of the center of a metallic square. The square is cooled down. The size of the hole will A) increase because the material around the hole gets smaller B) decrease because the material around the hole gets bigger C) stays the same size because there is nothing in the hole to change size. D) decreases because the hole contracts as if the hole wasn't there. 3. On a standing wave, the point on the wave that oscillates with the most is called the A) antinode B) nodeC) equilibrium, D) amplitude 4. You are holding an ice cube in your hand. The heat flows A) from your hand to the ice. B) both ways between the ice and your hand C) from the ice to your hand D) Need to know the temperature of the ice. 5. When the source of the sound and the observer of the sound get farther apart A) The observer detects a lower frequency than the source is producing B) The observer detects a higher frequency than the source is producing. C) The observer detects the same frequency as the source is producing. 6. The wavelength of the wave decreases. The speed and frequency of the wave will A) decrease, increase C) stay constant, increase. D) decrease, constant. B) stay constant, decrease 7. Which of the following is the highest temperature? A) 20 °C B) 20 °F 9)20 K D) All the same temperature. 8. Constructive interference between waves occurs when the waves are A) Exactly out of phase. B) Partly in phase and partly out of phase.D) All of these B) Exactly in phase.

Explanation / Answer

A 1. 25 dB

2. D

3.A

4.A

5. A

6. D

7. A

8. B

B 9. True

10. True

11. True

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