Ch 4 Flashcards
Electromagnetic waves can travel through matter, but not through a vacuum. True or False?
False
What is faster light or sound?
Light
Can light travel through opaque objects?
No
What is a diffuse reflection?
Occurs from a rough surface and doesn’t form a clear image
What is light?
Light is a type of wave called an electromagnetic wave
What is the difference between transparent and translucent?
Transparent- allows most light through and forms a clear image
Translucent- allows most light through but forms a blurry image
What is the function of the pupil?
An opening in the eye through which light enters.
What can sound travel through?
solids, liquids and gases
Name the three bones that are located in the middle ear.
stirrup
anvil
hammer
What is an echo?
It is a reflected sound wave.
What is the meaning of transparent?
Allows almost all light to pass through and forms a clear image.
What is the range of humans hearing frequencies?
20-20,000 hertz
What is a mirror?
Any reflecting surface that forms an image by regular reflection.
What do decibels measure?
loudness
How many rod cells and cones cells are in a human retina?
more than 100 million rod cells
over 6 million cone cells
What is a retina?
The layer of tissue in the eye that contains cells sensitive to the light.
What kinds of cells does the retina consist of?
light sensitive cells
If the angle of incidence is 40 degrees. What is the angle of reflection?
40 degrees
Can sound waves travel in space?
No
What are rod cells sensitive too?
low-light levels
What are two differences between light and sound?
Light can travel in space, and light is electromagnetic and sound in longitudinal
What part of the ear amplifies sound waves?
the middle ear
What type of image does a convex mirror show?
right-side up and smaller than the object
Sonar systems use…….to locate objects under water
sound waves
