Physics Chapter 7: Light Flashcards

Questions and Answers

Which of the following are luminous?

Cloud

Moon

Sun (correct)

Star

What is a source of light given off as a result of heating?

Incandescent

What is an idealized material that absorbs and emits electromagnetic radiation?

Blackbody

What term describes electromagnetic radiation given off from matter at any temperature?

Blackbody radiation Signup and view all the answers

How does light interact with matter?

All of the above Signup and view all the answers

What is the term for materials that do not allow transmission of light?

Opaque Signup and view all the answers

What is the term for light rays that travel in straight line paths?

Incident ray Signup and view all the answers

What do you call the image you see in the mirror?

Virtual image Signup and view all the answers

What happens during the refraction of light?

A change of speed between two transparent materials Signup and view all the answers

What is the ratio of the speed of light in a vacuum to the speed of light in a material?

Index of refraction Signup and view all the answers

What part of the electromagnetic spectrum can our eyes detect?

Visible light Signup and view all the answers

Who first studied the component colors of sunlight?

Newton Signup and view all the answers

What is the term for the separation of white light into its component colors?

Dispersion Signup and view all the answers

Polarization of light is best explained by considering it as what?

Vibrating wave in one plane Signup and view all the answers

What occurs when light in one plane is transmitted while light in all other planes is absorbed?

Selective absorption Signup and view all the answers

What effect is best explained by moving particles?

Photoelectric effect Signup and view all the answers

Who explained the photoelectric effect using Planck's work?

Einstein Signup and view all the answers

Today, light is considered to be what?

Packets of energy called photons Signup and view all the answers

What do fiber optics transmit information using?

Light Signup and view all the answers

What is a luminous object?

An object that produces light of its own by any method Signup and view all the answers

What describes an object that is hot enough to emit a dull red glow?

Shorter wavelength, higher frequency radiation Signup and view all the answers

How can you see in shaded areas?

Diffuse reflection Signup and view all the answers

What is the term for an image not produced by light rays coming from the image?

Temperatures Signup and view all the answers

Any part of the electromagnetic spectrum can be measured in units of?

All of the above Signup and view all the answers

What does a prism do to the colors of sunlight?

Separates them into a spectrum Signup and view all the answers

The phenomenon where light waves interfere is called what?

Interference Signup and view all the answers

What discovery did Max Planck make regarding vibrating molecules?

Energy in multiples of certain fixed amounts Signup and view all the answers

The polarization behavior of light can be explained by what?

Transverse waves Signup and view all the answers

Today, light is considered to be what scale phenomenon?

Small scale phenomenon Signup and view all the answers

As the temperature of an incandescent light increases, what happens?

More radiation is emitted with a shift to higher frequencies Signup and view all the answers

Is it possible to see light without light interacting with matter?

False Signup and view all the answers

Of the following, which electromagnetic wave has the lowest energy?

Radio wave Signup and view all the answers

What does green grass reflect?

Green light Signup and view all the answers

What does green grass absorb?

All light but green Signup and view all the answers

Why do we see a blue sky?

Scattering of light by air and dust is more efficient when its wavelength is shorter Signup and view all the answers

What visual effect occurs when a pencil is placed in a glass of water?

Refraction Signup and view all the answers

What is a one-way mirror designed to do?

Reflects and transmits light at the same time Signup and view all the answers

What causes a mirage?

Refraction Signup and view all the answers

What does a glass prism do to sunlight?

Separates it into a spectrum of colors Signup and view all the answers

Why do Polaroid sunglasses work effectively in eliminating glare?

Reflected light is polarized in a horizontal direction only Signup and view all the answers

What lens can correct the condition of farsightedness?

Convex lens Signup and view all the answers

Today, how is light considered in terms of energy?

Higher frequency light has more energy Signup and view all the answers

What is an instrument that produces a coherent beam of single frequency in phase light?

Laser Signup and view all the answers

Study Notes

Luminous Objects

Luminous objects produce their own light, e.g., the Sun.
Incandescent light is generated from heat.

Blackbody Concepts

A blackbody is an idealized material that absorbs and emits electromagnetic radiation perfectly.
Blackbody radiation occurs when matter emits radiation at any temperature.

Light Interaction with Matter

Light can interact with matter through reflection, refraction, and absorption.
Opaque materials do not allow light to pass through.

Rays and Images

Light is said to travel in straight paths called incident rays.
A virtual image is formed when light rays appear to diverge from a location in a mirror.

Refraction and Indices

Refraction occurs due to a change in the speed of light when transitioning between two transparent materials.
The index of refraction is the ratio of the speed of light in a vacuum to the speed in a material.

Electromagnetic Spectrum

The visible spectrum is the part of the electromagnetic spectrum that is detectable by human eyes.
Sir Isaac Newton first studied the component colors of sunlight.

Light Properties and Phenomena

Dispersion refers to the separation of white light into its component colors.
Polarization involves light vibrating in a single plane and is best explained by considering transverse waves.

Photoelectric Effect and Quantum Theory

The photoelectric effect is explained by the movement of particles, rooted in quantum theory.
Max Planck developed the concept of quanta, which describes energy emissions in fixed amounts.
Albert Einstein extended Planck's work to explain the photoelectric effect.

Photon Theory

Light is viewed today as packets of energy known as photons.
Fiber optics utilize light to transmit information efficiently.

Color Reflection and Absorption

Green grass reflects green light while absorbing all other colors.
The blue sky results from the scattering of light, which is more effective at shorter wavelengths.

Refraction and Optical Effects

A pencil submerged in water appears bent due to refraction.
A mirage occurs due to the refraction of light, creating the illusion of water in arid environments.

Prisms and Spectra

Glass prisms separate sunlight into a spectrum because each wavelength refracts at different angles.
Shorter wavelengths are refracted more than longer wavelengths.

Optical Instruments

Polaroid sunglasses reduce glare by filtering out horizontally polarized light.
Farsightedness can be corrected using a convex lens.
Lasers produce coherent beams of light at a single frequency.

Temperature and Light Emission

As the temperature of incandescent materials increases, more radiation is emitted at higher frequencies.

Light Perception

Vision requires light to interact with matter; it's impossible to see light without this interaction.

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Description

This quiz features flashcards covering key concepts related to light from Chapter 7 of your physics textbook. Test your knowledge on topics such as luminous sources, blackbody radiation, and electromagnetic radiation. Perfect for mastering the fundamental principles of light and its interaction with matter.