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The distance from crest to crest (or trough to trough) is the wavelength.

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Can the distance between two points be zero yet the displacement from one point to the other be nonzero?

No it cannot. The displacement can be zero and the distance nonzero, though. This, due to the fact that displacement takes in account the direction and magnitude, whereas the distance just takes in account the magnitude. For instance, if we were at a classroom, and I went to the bathroom and come back shortly after to the place were I started, my displacement would be 0, even though I traveled a certain distance. A simpler example would be the following: You take roll a ball back and forth, say to the exact position where it started. Through the time the ball rolls back and forth the distance it traveled will be increasing, whereas the direction will be canceling itself every time you go back into the starting point (the origin). Thus, distance does increase, whereas the displacement increases at point 2, and decreases in its way to point 1.


A student is describing a longitudinal wave in hia notebook he writes down the distance between crests is 3 cm what is wrong with what the student recorded?

The student should have described the distance between crests as wavelength instead of just distance. The wavelength is the distance between two consecutive crests in a wave, not just a general distance.


A point charge plus Q1 exerts electrostatic force on point charge plus Q2 that is 3 cm away if charges are now 6 cm apart what force will Q1 exert on Q2?

Just like the gravitational force between masses, the electrostatic force between two charges is inversely proportional to the square of the distance between them. When the distance between the charges is changed from 3cm to 6cm, the distance changes by the factor of (6/3) = 2. The force changes by the factor of ( 1/22 ) = 1/4. Its magnitude changes to 0.25 that of the original force.


Velocity is to speed as displacement is to?

Distance. Velocity is a measure of how fast an object is moving in a specific direction, while speed is just the rate at which an object moves. Similarly, displacement is a measure of how far an object is from its starting point in a specific direction, while distance is just the total length traveled.


What is the vertical distance between the trough and crest of a wave called?

The vertical distance between trough and crest is called the height of the wave. While the crest is the highest point of a wave, the trough is the lowest point.Are you talking about waves? That simply depends on the frequency of the wave; crest and trough are just terms given to sections of waves. The crest is the top of the wave, and the trough is the bottom.It's the amplitude. Like on the drawn parts of a transverse wave. You can look it up on google images.wave hight

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