COLORS OF LIGHT

COLORS OF LIGHT

page 207

Colors of Light

• White light is composed of all the colors in the visible part of the electromagnetic spectrum.

• Spectrum is the bands of colors.

• Dispersion is the process of splitting or separtion of white light by a prism into its bands of colors - ROY G BIV

• The spectrum is due to the difference in wavelength of spectral colors.

• Violet has a shoter wavelength and is bent the most.

• Each color of light has its own frequency.

• nanometer (nm) , 1 nm = 10^-9m (one thousand millionths of a meter)

• Terahertz (THz) is a unit of electromagnetic (EM) wave frequency equal to one trillion hertz (10¹² Hz)

• Electron-Volt is the unit of energy of photon.

Wavelength and Frequency of Light

• Violet has a higher frequency but shorter wavelength.

• Red has a lower frequency but longer wavelength.

• A high frequency indicates high energy, and the lower frequency indicates lower energy.

• The higher the frequency of the color, the higher its energy and the more intense the light is.

How is the rainbow formed?

• Rainbows are created by the dispersion of sunlight by raindrops. Red light arrives at the eye of the observer from the upper drop while violet light arrives from the lower drop. Other raindrops yield the other colors produce a continuous arc in the sky.

Photonics Engineer

• Photonics is the science of using light to generate energy and detect or transmit information.

• Photonics engineering aims to develop innovative and new products for telecommunication, manufacturing, medicine and construction.

continuation...

• From light that can cut plastic to highly accurate lasers used in delicate operations, photonics engineers contribute significant scientific discoveries in science and technology.

• A photonics engineer inproves systems and creates products using photonics like lasers, fiber optics, and imaging.

• They also creates lasers and optical materials that make a factory more energy efficient.

• In electronics manufacturing, photonics engneers determine the energy efficiency of the screen of televisions by testing crystals.

LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION

acronym "LASER"

Multiple Select

Light as a particle is explained by __________.

• corpuscular theory

• electromagnetic wave theory

• quantum theory

• wave theory

Multiple Choice

Unlike other types of waves, electromagnetic waves, do not _____.

• have amplitude

• have frequency

• need a medium

• transfer energy

Multiple Choice

Objects that do not allow light to pass through them are called _____.

• luminous

• opaque

• translucent

• transparent

Multiple Choice

Which object is a natural source of light?

• burning candle

• burning wood

• incandescent bulb

• star

Multiple Choice

The intensity of a light source can be measured using a device called ______.

• bunsen burner

• candle

• photometer

• standard lamp

Multiple Choice

A 20-cd lamp is palced at the 10.0 cm mark on a meterstick. A lamp of unknown intensity is placed at the 90.0-cm mark. If a Bunsen photometer is equally illuminated when placed at the 40.0-cm mark, what is the intensity of the unknown lamp?

• 24.5 cd

• 55.6 cd

• 95.5 cd

• 180.6 cd

Multiple Choice

The color of light is determined by its _____.

• amplitude

• trough

• wave speed

• wavelength

Multiple Choice

Which statement is true about colors of light?

• Violet light has the least frequency

• Red light has the greates frequency

• The wavelength of red light is the shortest.

• The wavelength of violet light is the shortest

Multiple Choice

A laser beam is a beam of light that _____.

• is specially in phase

• is of the same wavelength.

• travels in the same direction

• all of these

Multiple Choice

For different spectral colors, the intensity depends on its ____.

• amplitude

• crest

• frequency

• wave speed