SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They have very short wavelengths
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They transmit energy instead of matter
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They can travel through a vacuum
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They can change direction by reflection
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Detailed explanation-1: -Electromagnetic waves are not like sound waves because they do not need molecules to travel. This means that electromagnetic waves can travel through air, solid objects and even space. This is how astronauts on spacewalks use radios to communicate.
Detailed explanation-2: -Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
Detailed explanation-3: -One common behaviour is that they all travel at the same speed in a vacuum. All of these electromagnetic waves (whether radio, visible or gamma) travel at the same speed. They all travel at the ‘speed of light’ through a vacuum, that is at 3 × 10 8 m s-1.
Detailed explanation-4: -Generally speaking, we say that light travels in waves, and all electromagnetic radiation travels at the same speed which is about 3.0 * 108 meters per second through a vacuum. We call this the “speed of light"; nothing can move faster than the speed of light.
Detailed explanation-5: -Light travels slower in air than in a vacuum, and even slower in water. As light travels into a different medium, the change in speed bends the light.