Waves 1 Review CONCEPTS you need to know

Waves 1 Review

CONCEPTS you need to know… • A surfer who wishes to ride a big wave is most interested in the ____ of a wave. • A sound wave that has a higher frequency has a wavelength that is SHORTER/LONGER? • The frequency of the second hand on a clock is _____. A weight on the end of a spring bobs up and down one complete cycle every 5 seconds. Its period is ________.

Practice Problem 1 A tuning fork has a frequency of 280 Hz. and the wavelength of the sound produced is 1. 5 m. Calculate the velocity.

Practice Problem 2

Practice Problem 3 The speed of light is 3. 0 x 108 m/s. Red light has a wavelength of 7 x 10 -7 m. What is its frequency?

Practice Problem 4 The frequency of violet light is 7. 5 x 1014 hertz. What is its wavelength?

Practice Problem 5 A jump rope is shaken producing a wave with a wavelength of 0. 5 m with the crest of the wave passing a certain point 4 times per second. What is the velocity of the wave?

YOUR TURN #1 Waves in a lake are 6 m apart and pass a person on a raft every 2 s. What is the frequency, period, wavelength, and speed of the waves?

YOUR TURN #2 A buoy bobs up and down in the ocean. The waves have a wavelength of 2. 5 m, and they pass the buoy at a speed of 4. 0 m/s. What is the frequency of the waves? How much time does it take for one wave to pass under the buoy?

25. 2 Wave Description • The high points on a wave are called crests. • The low points on a wave are called troughs. • The term amplitude refers to the distance from the midpoint to the crest (or trough) of the wave. • The amplitude is the maximum displacement from equilibrium. • The wavelength of a wave is the distance from the top of one crest to the top of the next one.