Unit 10 Worksheet #1 Wave Properties and Wave Calculations

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Unit 10 Worksheet #1—Wave Properties and Wave Calculations

1. The speed of sound in sea water is about 1530 m/s. If a sound wave has a frequency of 2.50 × 102 Hz, what is its wavelength in seawater?

2. Cicadas produce a sound that has a frequency of 123 Hz. What is the wavelength of this sound in the air? The speed of sound in air is 334 m/s.

3. The highest-pitched sound that a human ear can detect is about 21 kHz. On the other hand, dolphins can hear ultrasound with frequencies up to 280 kHz. What is the speed of sound in water if the wavelength of ultrasound with a frequency of 2.80 × 105 Hz is 0.510 cm? How long would it this sound wave to travel to a dolphin 3000m away?

4. Earthquakes also produce transverse waves that move more slowly than the p-waves. These waves are called secondary waves, or s-waves. If the wavelength of an s-wave is 2.3 × 104 m, and its frequency is 0.065 Hz, what is its speed?

5. A dog whistle is designed to produce a sound with a frequency beyond that which can be heard by humans (between 20 000 Hz and 27 000 Hz). If a particular whistle produces a sound with a frequency of 2.5 × 104 Hz, what is the sound’s wavelength? Assume the speed of sound in air to be 331 m/s.

6. The lowest pitch that the average human can hear has a frequency of 20.0 Hz. If sound with this frequency travels through air with a speed of 331 m/s, what is its wavelength?

7. A ship anchored at sea is rocked by waves whose crests are 14 m apart. The waves travel at 7.0 m/s. How often do the wave crests reach the ship?

8. Two tuning forks are struck at the exact same time. One has a frequency of 256Hz and one has a frequency of 512Hz. Which sound should you hear first? Explain your answer.