Key Terms and Key Phrases
A longitudinal wave that can travel only through matter.
What is: Sound
Define Light Ray
What is: A narrow beam of light that travels in a straight line.
Name a difference between light and sound waves.
What is: Answers will vary.
Name the two types of reflections.
What are: Regular and diffuse.
Something that emits light.
What is: Light Source
Define Transparent
What is: Allows almost all light to pass through it as a clear image.
Name the two components that can be used to describe a sound wave.
What are: Wavelength and frequency.
Name three types of mirrors you might see in the world.
What are: Plane, Concave, Convex
A reflected sound wave.
What is: Echo
Define Mirror
What is: Any reflecting surface that forms an image by regular reflection.
Name the SI unit for sound frequency.
What is: Hertz (Hz)
Briefly explain how the iris reacts to light.
What is: The iris changes size depending on how much light there is. If there’s a lot of light, it relaxes, causing the pupil to shrink. If there's little light, it contracts, causing the pupil to grow.
The perception of how high or low a sound seems.
What is: Pitch
Define Lens
What is: A transparent object with at least one curved side that causes light to change direction.
Name the state of matter in which sound travels the fastest.
What is: Solids
Name the difference between cone cells and rod cells.
What is:
Rod cells are sensitive to low-level/dim light, and enable a person to see in dim light.
Cone cells need bright lights to function, and provide an individual with information in regards to color.
An object that does not allow light to pass through it.
What is: Opaque
Name the different parts of the eye. (4)
What is: Cornea, Iris, Pupil, Retina
Name the three basic parts of the human ear.
What is: Outer Ear, Middle Ear, Inner Ear
Name the three ways light interacts with matter.
What are: Transmission, Reflection, and Absorption.