Quiz Standard 7 Answer Key
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- Explanation
- Explanation: You see an image of yourself in a mirror because light waves are reflected back at you.
- Explanation: This is because electromagnetic waves travel at different speeds through different media.
Explanation: You see lightning before you hear thunder because light waves travel faster than sound waves. Sound waves travel through air at the speed of approximately 1,100 feet per second; light waves travel through air and empty space at a speed of approximately 186,000 miles per second. 32) The hammering on a train track is often heard twice by workers farther down the track; first as the sound travels through the steel and second as the sound travels through the air. This suggests which graph is true?
Explanation: The speed of sound in steel or any solid is faster than the speed of sound through air. This means the steel bar on the graph graph should be the larger of the two. This is true in graph D. 33) 
You see an image of yourself in a mirror because light waves are
Explanation: You see an image of yourself in a mirror because light waves are reflected back at you. When a surface is bumpy, light waves are scattered and you cannot see a mirror image. 34) 
Although you can see the pencil, it appears broken in the glass of water. This is because
Explanation: This is because electromagnetic waves travel at different speeds through different media. This is called refraction and it causes the pencil to appear broken or bent. Electromagnetic waves are not compression waves. The speed of electromagnetic waves is fastest in a vacuum; the waves slow as the medium becomes more dense. 35) 
As the band passed by, the beating drums and trumpets made Billy feel like his body was beating with the music. He could hear the music and he could feel it! How would a scientist explain this to Billy?
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