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# Science Ch. 1 Q+A

### Science chapter 1 (sound and light) questions and answers

What does amplitude describe? How far the medium in a wave moves.
What does wavelength describe? A wave's length.
What does frequency describe? How often a wave occurs.
What does speed describe? How quickly a wave moves.
What do all waves have in common? Their properties - amplitude, wavelength, frequency, and speed.
What is the amplitude of a transverse wave? The maximum distance the medium moves up and down from its rest position.
What is the amplitude of a longitudinal wave? A measure of how compressed or rarefied the medium becomes.
When compressions are dense, what does that mean about the wave? That the wave's amplitude is large.
How do you find the wavelength of a transverse wave? By measuring the distance from crest to crest.
How do you find the wavelength of a longitudinal wave? By measuring the distance between compressions.
What units is frequency measured in? Hertz or Hz.
If 2 waves pass every second what is the frequency of the 2 waves? 2 waves per second (2/s) of 2 Hz.
How do you determine a wave's speed? By dividing the distance it travels by the time it takes to travel that distance.
What are speed, wavelength, and frequency related by? A mathematical formula.
Speed = Wavelength x Frequency
Frequency = Speed / Wavelength
Wavelength = Speed / Frequency
What are the ways waves change direction? Reflection, refraction, and diffraction.
What is an incoming wave? A wave moving toward the surface at an angle.
What is the angle of incidence? The angle between the incoming wave and the normal.
What is the normal? A line perpendicular to the surface at the point where reflection occurs.
What is the angle of reflection? The angle between the reflected wave and the normal.
What is the reflected wave? A wave bouncing off the surface at an angle.
What happens when a wave enters a new medium at an angle? One side of the wave changes speed before the other side. This causes the waves to bend.
Why does bending occur? Because different parts of the wave travel at different speeds.
What happens when water waves encounter canals or shorelines? They diffract.
What are the two types of interference? Constructive interference and destructive interference.
Is the amplitude of the wave combined in constructive interference large or small? Large.
Is the amplitude of the wave combined in destructive interference large or small? Small.
What happens if the incoming wave and reflected wave have the same frequency? They combine to form a standing wave.
What kind of amplitude does a node have? Zero amplitude.
What kind of amplitude does an antinode have? The maximum amplitude.
What is resonance? An increase in the amplitude of a vibration that occurs when external vibration match an object's natural frequency.
Created by: KiraZ22