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they annihilate each other
nothing.
for apex learners it is the sound becomes softer or disappears
I'm guessing you're talking about Transverse waves? eg. ~ Waves consist of two parts - a crest and a trough. The crest are the high points, and a trough is the low points. When a crest meets another crest, the wave is amplified, causing constructive interference (the crests add to each other). The same thing occurs when a trough meets a trough. However, when a crest meets a trough, the wave is diminished, causing destructive interference (the crest and trough cancel each other out).
Essentially the amplitude will become zero. If you think of 2 waves (sea waves will do). If the 2 crash together when one is at the top of it crest and the other at the bottom then they will cancel each other out and you will have a flat pond. This is a very simple way of putting it but I hope you get the idea.
they annihilate each other
The highest point of a transverse wave is known as the crest, while the lowest point is called the trough. When the crest of one wave strikes against the trough of another wave, the forces of energy working in opposite directions with cancel out the effects of each other.
Traveling can teach you respect towards other customs and beliefs of other cultures. Also can teach you adaptation in different countries. Accepting everybody should be one lesson while traveling because we are all humans. Traveling should open our eyes to know how the rest of the world lives and learn from them.
A crest is a symbol used by families. In olden times the crest was sealed to letters and other important papers.
In the last boss, the crest is an hourglass. But, if you mean the other crest, it's the Triforce.
The cookatoo flared her crest as she squarked loudly at the other birds
nothing.
1) Crest of one wave meets the crest of other wave OR Trough of one wave meets the trough of other wave.
You can start by purchasing a Sunday newspaper as they most likely would have coupons in it. Other way are to go to Crest's website, companies always offer coupons. You can also call Crest and tell them you love Crest, you can get coupons that way as well.
for apex learners it is the sound becomes softer or disappears
Like poles attract. Unlike poles repel. So north and south will attract towards each other, while north and north (and south to south) will repel.
I'm guessing you're talking about Transverse waves? eg. ~ Waves consist of two parts - a crest and a trough. The crest are the high points, and a trough is the low points. When a crest meets another crest, the wave is amplified, causing constructive interference (the crests add to each other). The same thing occurs when a trough meets a trough. However, when a crest meets a trough, the wave is diminished, causing destructive interference (the crest and trough cancel each other out).