University:
Eastern Kentucky University
Course:
PHY 132 | College Physics II
Academic year:

2021
Views:

76

Pages:

2
Author:

kundgetanufv

Light Waves and Matter Name: 1. A light wave is an electromagnetic wave which has both an electric and magnetic component associated with it. Electromagnetic waves are often distinguished from mechanical waves. The distinction is based on the fact that electromagnetic waves a) can travel through materials and mechanical waves cannot b) come in a range of frequencies and mechanical waves exist with only certain frequencies c) can travel through a region void of matter and mechanical waves cannot electromagnetic waves cannot transport energy and mechanical waves can transport energy e) electromagnetic waves have an infinite speed and mechanical waves have a finite speed 2. Consider the diagram below. It represents the beginnings of an electromagnetic spectrum below. Complete the diagram by labeling the following regions: ultraviolet, infrared, x-ray, radio wave, gamma radiation, and microwave radiation. RADIO MICRO IR Visible light XRAY GAMMA Long wavelength Short Wavelength Low f High f 3. Which region of the electromagnetic spectrum has the highest frequency? right side (HAMMA) 4. Which region of the electromagnetic spectrum has the longest wavelength? left side (RADIO) 5. Which region of the electromagnetic spectrum will travel with the fastest speed? ALL TRAVEL AT SAME SPEED 6. It is known that electromagnetic waves with longer wavelengths have a greater ability to bend around obstacles that get in their path. This ability to bend around obstacles is referred to as diffraction. Electromagnetic waves with strong diffraction properties are used in communication. Which two regions of the spectrum have the greatest ability to diffract? RADIO 9 MICRO 7. It is known that electromagnetic waves with high frequency are more capable of causing damage to the organs of living things. Which two regions of the spectrum have the tendency to cause the greatest damage to humans? X-RAY GAMMA 8. Light that the human eye is capable of detecting is known as visible light. There is a range of frequencies that the eye can detect. Various frequencies are observed as different colors. The diagram below represents the range or spectrum of visible light frequencies labeled with their respective colors. Infrared Red Orange Yellow Green Blue Indigo Violet Ultraviolet 9. Which color of the visible light spectrum has the highest frequency? VIOLET 10. Which color of the visible light spectrum has the longest wavelength? RED 11. Light and material objects always interact in one way or another. When light is incident on some materials, it is transmitted through the material. For instance, visible light is transmitted through glass. Glass is said to be to visible light. a transparent b. Opaque 12. Other materials absorb and/or reflect light only. They do not allow light to pass through it Such materials are said to be transparent b. Opaque 13. Some material objects are transparent to certain forms of electromagnetic waves but opaque to other forms. Earth's atmosphere is an example. The atmosphere allows visible light to pass through it. Much of the more damaging portion of the ultraviolet spectrum is blocked by a thin layer of ozone in the stratosphere. The atmosphere is said to be TRANSPARENT OPAQUE (transparent, opaque) to visible light but (transparent, opaque) to ultraviolet light.