# Inc1 Modules 3-9

Submitted By nestavi
Words 11922
Pages 48
Module 3 Waves and the Electromagnetic Spectrum
Topic: Waves 1. What is a wave?
A wave is vibration that travels and all waves are created by something vibrating. Waves transport energy but do not transport mass. 2. Describe the following terms associated with waves:
a. amplitude­ height of wave
b. wavelength­ length of a wave
c. frequency­ number of waves per second (Hz)
d. period­ how long a wave lasts when it arrives at a fixed point (measured in seconds)

An electromagnetic wave of a frequency used for long­ distant communication. 4. Explain the difference between a transverse wave and a longitudinal wave, and give examples of each. In a longitudinal wave, the vibration travels in the same direction that wave travels. Examples of longitudinal waves include: Sound, p­-waves (earthquakes) In a transverse wave, the vibration direction is perpendicular to direction that wave travels. Examples include: Light/electromagnetic, (radio, microwave, x­ray, etc.), water waves, s­waves (earthquakes). The major difference between longitudinal and transverse waves is their direction. Longitudinal waves move left to right while transverse waves move up and down.

5. Compare and contrast: light waves vs. sound waves
Light waves are transverse and sound waves are longitudinal. Light waves can travel through a vacuum but sound waves cannot. Speed of light is nearly 300 million m/s while sound has a speed of about 340 m/s. 6. What changes the pitch of sound?
The frequency of vibration. Faster vibration would cause a higher pitch while slower vibration would cause a lower pitch. 7. Explain how different factors affect the speed of sound?
Speed of sound depends on factors such as altitude, humidity, and temperature because sound waves need molecules to collide in...

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