Help pls 100points Light waves are
a. electric and soundlike
b. magnetic and soundlike
c. electric and magnetic
d. electric only
2
Which of the following does "not" require a physical medium through
which to travel?
a. light
b. sound
c. both light and sound
d. neither light nor sound
3
Waves with frequencies slightly lower than those of visible light
are called
a. ultraviolet rays
b. gamma rays
c. X-rays
d. infrared rays
4
Waves with frequencies slightly higher than those of visible light are
a. gamma rays
b. ultraviolet rays
c. radio waves
d. infrared rays
5
Which of the following indicates that light is made up of particles
rather than waves?
a. reflection
b. refraction
c. photoelectric effect
d. bending and separation
6
Which of the following is an example of an illuminated object?
a. moon
b. sun
c. light bulb
d. fluorescent tube
7
An object is luminous if it can produce
a. fluorescent light
b. incandescent light
c. neon light
d. all of these
8
Light produced from heat is said to be
a. luminous
b. incandescent
c. illuminated
d. fluorescent
9
Light produced by electron bombardment of low-pressure gases is
a. luminous
b. incandescent
c. illuminated
d. fluorescent
10
The light produced when electrons pass through pure neon is
a. blue-green
b. yellow-orange
c. red
d. any color
11
Electromagnetic waves with the shortest wavelength are called .
12
Waves used for communication, in radar, and for cooking are called
.
13
Any object that gives off its own light is said to be .
14
Electromagnetic waves with the longest wavelength are called .
15
The variation in either amplitude or frequency of a wave is called
.
16
Electromagnetic waves cannot travel through a vacuum.
a. true
b. false
17
Light is made up of a stream of energy packets called electrons.
a. true
b. false
18
An ordinary electric light bulb is an example of an incandescent
object.
a. true
b. false
19
Fluorescent lighting uses less electricity than does incandescent
lighting.
a. true
b. false
20
Ultraviolet waves are used to locate objects and monitor speed.
a. true
b. false