Chapter 9 test questions

40 terms · Mrs. Bravo Period 4

Infrared rays

examples: incubator

examples: Seeing

Ultraviolet Rays

examples: Getting rid of cancer

X-rays

examples: Check for broken bones inside the body

Gamma rays

Diagnose and treat cancer

Electromagnetic Waves

Consists of changing electric and magnetic fields

Wavelength

The distance between the crests of waves

Frequency

The number of waves that pass a particular piont in a certain amount of time

The energy transferred by electromagnetic waves

Comic waves/Gamma

Electromagnetic waves with the shortest wavelengths and highest frequencies are

Regular and Diffuse

Two kinds of reflection

Image

A copy of an object formed by reflected or refracted rays of light

Concave; convex, plane

A(n)________________ mirror can form real and virtual images. _________ and __________ mirrors form only virtual images.

Virtual and Real

Two types of images produced by mirrors

Diffuse

___________ reflection occurs when light hits an irregular surface.

Regular

____________ reflection occurs when light hits a smooth surface.

Real

A(n)___________ image is formed when light rays meet.

Optical Axis

The _______________ is an imaginary line that divides a mirror in half.

Focal Point

The________________ is the point at which light rays parallel to the optical axis meet.

Virtual

A(n) ________________ image is right-side up.

Plane

A(n) _________________ mirror is a flat glass with silver colored coating on one side.

Mirage

A(n) _________________ is an image of a distant object caused by light refraction through air of varying temperature.

Lens

A(n) _________________ is a curved piece of glass or other transparnet substance that is used to refract light.

Convex

A(n) _________________ lens is thicker in the center than at the edges.

Concave

A(n) _________________ lens is thinner in the center than at the edges.

Index

The __________________ of refraction is a measure of how much a ray of light bends when it passes from one medium into another.

Reflection

When waves bounce off a barrier

Transverse

Electromagnetic waves are ______________ waves.

Reflected sound

Height of a wave

Top of a wave

Bottom of a wave

Wavelength

Distance of one complete wave

Frequency

Number of wave cycles in a given unit of time

Refraction

Bending of light through a medium

Einstein

German-American physicist 1879- 1955

Medium

Intervening substance that allows waves to pass

Elasticity

Density of a medium