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St. Adalberts > Ch 4 > Flashcards

Ch 4 Flashcards

1
Q

Electromagnetic waves can travel through matter, but not through a vacuum. True or False?

A

False

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2
Q

What is faster light or sound?

A

Light

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3
Q

Can light travel through opaque objects?

A

No

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4
Q

What is a diffuse reflection?

A

Occurs from a rough surface and doesn’t form a clear image

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5
Q

What is light?

A

Light is a type of wave called an electromagnetic wave

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6
Q

What is the difference between transparent and translucent?

A

Transparent- allows most light through and forms a clear image
Translucent- allows most light through but forms a blurry image

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7
Q

What is the function of the pupil?

A

An opening in the eye through which light enters.

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8
Q

What can sound travel through?

A

solids, liquids and gases

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9
Q

Name the three bones that are located in the middle ear.

A

stirrup
anvil
hammer

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10
Q

What is an echo?

A

It is a reflected sound wave.

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11
Q

What is the meaning of transparent?

A

Allows almost all light to pass through and forms a clear image.

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12
Q

What is the range of humans hearing frequencies?

A

20-20,000 hertz

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13
Q

What is a mirror?

A

Any reflecting surface that forms an image by regular reflection.

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14
Q

What do decibels measure?

A

loudness

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15
Q

How many rod cells and cones cells are in a human retina?

A

more than 100 million rod cells

over 6 million cone cells

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16
Q

What is a retina?

A

The layer of tissue in the eye that contains cells sensitive to the light.

17
Q

What kinds of cells does the retina consist of?

A

light sensitive cells

18
Q

If the angle of incidence is 40 degrees. What is the angle of reflection?

A

40 degrees

19
Q

Can sound waves travel in space?

A

No

20
Q

What are rod cells sensitive too?

A

low-light levels

21
Q

What are two differences between light and sound?

A

Light can travel in space, and light is electromagnetic and sound in longitudinal

22
Q

What part of the ear amplifies sound waves?

A

the middle ear

23
Q

What type of image does a convex mirror show?

A

right-side up and smaller than the object

24
Q

Sonar systems use…….to locate objects under water

A

sound waves

25
Q

What cells in your eye do not work in the dark?

A

cone cells

26
Q

What is the pain threshold of human in the decibel scale?

A

120 decibels(dB)

St. Adalberts (6 decks)

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