Physics Waves and Light Flashcards

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Questions and Answers

What type of wave is a light wave?

Light waves are both transverse and electromagnetic waves.

What are radio waves used for?

Radio waves are used in radios.

What are microwaves used for?

Microwaves are used to heat foods.

What are radar waves used for?

<p>Radar waves are used by policemen and fishermen.</p> Signup and view all the answers

What are infrared light waves used for?

<p>Infrared light waves are used for sensing and heating.</p> Signup and view all the answers

What is visible light?

<p>Visible light waves are the only waves on the EM spectrum that humans can see.</p> Signup and view all the answers

What are ultraviolet waves used for?

<p>Ultraviolet waves are used for sanitizing and sterilization.</p> Signup and view all the answers

What are X-rays used for?

<p>X-rays are used by doctors to see broken bones.</p> Signup and view all the answers

What are gamma rays used for?

<p>Gamma rays are used in the medical field to break up tumors.</p> Signup and view all the answers

List the EM spectrum waves in order from slowest to fastest.

<p>Radio waves, microwaves, radar, infrared, visible light, ultraviolet, X-rays, gamma rays, cosmic rays.</p> Signup and view all the answers

What are transparent objects?

<p>Transparent objects allow light to travel through them.</p> Signup and view all the answers

What are translucent objects?

<p>Translucent objects allow some light to pass through.</p> Signup and view all the answers

What are opaque objects?

<p>Opaque objects do not allow any light to pass through.</p> Signup and view all the answers

What is a shadow?

<p>A shadow is made when an object blocks a portion of the light source.</p> Signup and view all the answers

What is visible light?

<p>Visible light waves are the only part of the electromagnetic spectrum that we can see.</p> Signup and view all the answers

What are the seven colors of the visible spectrum?

<p>Red, orange, yellow, green, blue, indigo, and violet.</p> Signup and view all the answers

Flashcards

Electromagnetic Spectrum

A range of types of radiation, including light, organized by frequency and wavelength.

Transverse Wave

Light waves move in perpendicular direction to direction of energy transfer.

Light Frequency

The number of waves passing a set point per unit of time.

Visible Light

The portion of the electromagnetic spectrum humans can see.

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Transparent Material

Material that allows light to pass through without scattering.

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Translucent Material

Material that lets some light pass through but scatters light.

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Opaque Material

Material that absorbs or reflects all light.

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Shadow

An area where light is blocked by an object.

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Radio Waves

Electromagnetic waves used for radio and television.

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Microwaves

Electromagnetic waves used for cooking food.

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Infrared

Electromagnetic waves used for warmth (and some security).

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Ultraviolet (UV)

Electromagnetic waves used in sterilization, tanning beds, and some security.

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X-Rays

Electromagnetic waves used for medical imaging (and security).

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Gamma Rays

Electromagnetic waves used to treat cancer.

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ROY G BIV

Mnemonic for the colors of visible light (Red, Orange, Yellow, Green, Blue, Indigo, Violet).

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Study Notes

Light Waves

  • Light waves are transverse and part of the electromagnetic spectrum, oscillating with varying frequencies.
  • Red light has the lowest frequency, while violet has the highest.
  • Light does not require a medium to travel.

Electromagnetic Spectrum Waves

  • Radio Waves: Used in radios providing amplitude modulation (AM) and frequency modulation (FM) for sound.
  • Microwaves: Utilized for heating food; common household microwaves operate using magnetrons.
  • Radar: Employed by law enforcement and fishermen for detecting objects and tracking fish.
  • Infrared Waves: Used by police for detection; also in heating lamps to keep food warm.
  • Visible Light: The only portion of the spectrum visible to humans containing red, orange, yellow, green, blue, indigo, and violet, arranged from slowest to fastest.
  • Ultraviolet Waves: Invisible to humans and used for sanitizing and sterilization in medical settings.
  • X-Rays: Medical tool for diagnosing broken bones and examining luggage in airport security.
  • Gamma Rays: Powerful waves used in medicine for cancer treatment to destroy tumors.

Order of Electromagnetic Spectrum

  • Waves arranged from slowest to fastest: Radio Waves, Microwaves, Radar, Infrared, Visible Light, Ultraviolet, X-Rays, Gamma Rays, Cosmic Rays.

Properties of Materials

  • Transparent: Allow light to travel through (e.g., air, clear glass).
  • Translucent: Permit some light to pass through but scatter it, causing blurred visibility (e.g., frosted glass).
  • Opaque: Block all light, either reflecting or absorbing it (e.g., wood, metal).

Shadows

  • Formed when an object obstructs light, casting a shadow in the opposite direction of the light source.

Visible Light Waves

  • Represent the segment of the electromagnetic spectrum that humans can see, with optimal frequencies for visibility.

Seven Colors of Visible Light

  • The seven colors are red, orange, yellow, green, blue, indigo, and violet, remembered through the acronym ROY G BIV. Red has the lowest frequency, while violet has the highest.

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