10 minutes maximum! Can you do it in 5?

Q1+2: In a small pool by the beach, 20 small water waves hit a rock every 5 seconds. 1. The frequency of the waves is....

• A. 0.25 Hz
• B. 0.25 s
• C. 4 Hz
• D. 4 s

2. The period of the waves is....

• A. 0.25 Hz
• B. 0.25 s
• C. 4 Hz
• D. 4 s

3. The time period of a sound wave with a frequency of 200 Hz will be...

• A. 0.5 s
• B. 0.2 s
• C. 5 ms
• D. 2 ms

4. Which of these is the correct formula for wave speed?

• A. wave speed = frequency x amplitude
• B. wave speed = frequency x wavelength
• C. wave speed = wavelength x amplitude
• D. wave speed = frequency x amplitude x wavelength

5. Which of these is the standard unit for wave speed?

• A. m Hz
• B. Hz / m
• C. m/s
• D. s/m

What are the missing values in this results table from experiments with water waves?

 Frequency Wavelength Wave speed 6. 2 Hz 8 m ? 16 m/s 10 m/s 4 m/s 0.25 m/s 7. 0.1 Hz ? 0.1 m 1 m 10 m 100 m 10 m/s 8. ? 3 Hz 0.333 Hz 3.33 Hz 0.3 Hz 13 m 3.9 m/s

Q9&10.

A team of scientists are visiting a coastal area. They are considering building a power station using ocean waves. The waves typically have the following measurements:

• Time period = 12 s
• Velocity = 4 m/s
• Amplitude = 0.8 m 9. What is the frequency of these waves?

• A. 4.8 Hz
• B. 0.25 Hz
• C. 0.083 Hz
• D. 2 Hz

10. What is the wavelength of these waves?

• A. 0.33 m
• B. 3 m
• C. 3.2 m
• D. 48 m