Wavelength True/False

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(True / False) A straight wave heads into a curved surface. It will reflect so that the wave scatters

(True / False) When a straight wave pases through a small opening, it produces a small straight wave.

(True / False) Unless it is disturbed each point on a wave will travel along either a straight or curved path.

(True / False) When an wave hits a barrier, the angle that it reflects depends on its speed.

(True / False) As a wave changes media its speed changes.

(True / False) Two waves traveling through the same medium meet, they will bounce off each other and change direction.

(True / False) The speed of a wave is determined by its medium.

(True / False) Defraction is the bending of a wave because its speed changes.

(True / False)As the frequency of a wave increases, its wavelength increases.

(True / False) During refraction, a wave bends because it hits the edge of a barrier.

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Here's my best answers for all of them.

1. T - a curved surface will make a wave bend
2. T - a small opening will make the wave be small
3. F - it will travel on a straight path if undisturbed
4. F - the angle depends on the barrier angle
5. T - speed is determined by media
6. F - the two waves will not necessarily change direction
7. T - speed is determined by media
8. F - diffraction is bending because of a barrier
9. F - frequency and wavelength are inversely related
10. F - refraction bends a wave because of media change
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Many thanks,
Jameson
 

Answers and Replies

  • #2
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What is this wave, water, light, sound what?
 
  • #3
HallsofIvy
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(True / False) A straight wave heads into a curved surface. It will reflect so that the wave scatters
True but because a curved surface "spreads" out the wave- so it scatters. Even a straight surface will cause a wave to "bend"- that's not scattering.

(True / False) When a straight wave pases through a small opening, it produces a small straight wave.
False! A small opening acts like a "point source" the wave spreads out in circles.

(True / False) Unless it is disturbed each point on a wave will travel along either a straight or curved path.
? But it says "straight or curved path"! that's certainly true. Frankly I don't like the reference to a "point on a wave"- I assume this refers to a ray, but that's not clear. Anyway, if a water wave, for example, travels over a sloping bottom it will curve. Is that "disturbed" or not? Bad question in my opinion.

(True / False) When an wave hits a barrier, the angle that it reflects depends on its speed.
False. a wave will always reflect to make equal angles with the barrier.

(True / False) As a wave changes media its speed changes.
In general that's true. Of course, it is possible that two "different" media give the same wave speed.

(True / False) Two waves traveling through the same medium meet, they will bounce off each other and change direction.
False, they pass right through each other.

(True / False) The speed of a wave is determined by its medium.
True- as long as "medium" is understood to include the depth as well as the density of the liquid for waves in liquid.

(True / False) Defraction is the bending of a wave because its speed changes.
?? True- if the word was supposed to be "refraction", false if "diffraction". Bending because of a barrier is "reflection".

(True / False)As the frequency of a wave increases, its wavelength increases.
False, they are inversely proportional.

(True / False) During refraction, a wave bends because it hits the edge of a barrier.
False- that's "reflection". But why did you answer the opposite way in question 8?
 

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