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
7.
 0.1 Hz 10 m/s
8. 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