1. Motion and Energy
Light

2. electric, magnetic
Light is vibrating _____________ and ____________ energy.

3. perpendicular
2. Light waves vibrate in directions _______________ to the
direction of motion.

4. Wavelength
3. _____________________ is the distance between one peak and the next in a wave.

5. frequency
4. The number of vibrations a wave makes in a given amount of time is its ________________________.

6. light rays
5. Light travels in straight lines is called __________ __________.

7. photons
6. Particles of light are called ______________________.

8. reflection
7. When light strikes an objects surface, photons bounce off. ________________ is the term for any wave that hits a surface and bounces off.

9. absorption
8. Sometimes when light hits an object, a photon is absorbed. ________________ is the transfer of energy when a wave disappears into a surface. Darker objects absorb more light than lighter objects.

10. transparent, translucent, opaque
9. If most light goes through an object, the object is
_______________; if some light goes through, the object is
_______________; if no light goes through, the object is
_______________.
Plastic wrap Wax paper Aluminum Foil
Transparent Translucent Opaque

11. shadows 10. Objects that do not allow light to pass through cause
____________________.

12. scattering
11. When light strikes an object with a rough surface, photons bounce off at random angles. This is called ___________________________.

13. concave, convex
12. Mirrors can be made with a curved surface; if they curve in, they are __________________, and if they curve out they are
_________________.

14. upright, reduced
13. Curved mirrors can form many kinds of images. They might be upright or upside down. Convex mirrors always produce images that are __________ and ______________.

15. speed, bending
14. When light enters a different medium, its speed changes and it undergoes _______________. Refraction is the ___________ of waves as they pass from one substance to another.

16. prism 15. White light is a mixture of many different wavelengths
that can be separated by a _____________ to form a spectrum.

17. prism, spectrum
16. A _____________________ is a cut piece of clear glass or plastic in the form of a triangle or other geometric shape. The band of color in a rainbow, or from light passing through a prism, is called a _______________.

18. electromagnetism
17. The way in which electric and magnetic forces interact is called ___________________________.

19. electromagnetic
18. Many forms of ____________ radiation cannot be seen with the human eye.

20. Sun
19. The ___________ can produce all forms of electromagnetic radiation.

21. Explain how a magnifying glass helps people see objects that are small.
A magnifying glass uses a convex lens to produce an image that
is larger than the object. This allows things that are small to be
seen on a much larger scale.