physics unit 8

Relationship between frequency and wavelength?

Inverse relationship

• Higher frequency = shorter wavelength

• Lower frequency = longer wavelength

Relationship between energy and frequency?

Direct relationship

• Higher frequency = higher energy

Q: Relationship between energy and wavelength?

Inverse relationship

• Shorter wavelength = higher energy

Electromagnetic spectrum order (lowest → highest energy)?

Radio → Microwave → Infrared → Visible → UV → X-ray → Gamma

Which EM wave has lowest energy?

Radio waves

Which EM wave has shortest wavelength/highest energy?

Gamma rays

Primary colors of light?

• Red

• Green

• Blue

Secondary colors of light?

A:

• Red + Green = Yellow

• Green + Blue = Cyan

• Blue + Red = Magenta

Primary pigment colors?

CMYK

• Cyan

• Magenta

• Yellow

• Black

Pigments work by doing what to light?

Absorbing some wavelengths and reflecting others

Law of Reflection?

Angle of incidence = angle of reflection
(θi = θr)

What is the normal line?

Imaginary line perpendicular to the surface

Types of reflection?

• Specular: smooth surface, clear image

• Diffuse: rough surface, scattered light

What is refraction?

Bending of light when it changes medium

Refractive index formula?

n = c/v

• c = speed of light in vacuum

• v = speed in medium

Light entering denser medium bends

Toward the normal

Light entering less dense medium bends…?

Away from normal

In denser medium, light speed…?

Decreases

Critical angle?

Angle where refracted ray is 90°