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storchak [24]
3 years ago
15

Why does a siren have a lower pitch as it moves away from you? A The period of the sound wave is decreased B The amplitude of th

e sound wave is increased C The crests of the sound wave are farther apart D The troughs of the sound wave are spaced closer together. ​
Physics
2 answers:
Phantasy [73]3 years ago
7 0

Answer:

C

Explanation:

I think it's C because when it moves further away the sound wave is moving apart  

sweet-ann [11.9K]3 years ago
4 0

Answer:

it is letter C

there is a video explaining this

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A 3.0-kg block moves up a 40o incline with constant speed under the action of a 26-N force acting up and parallel to the incline
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3 years ago
You are designing an optical fiber scope for directing light into a confined area. You want to keep light within the fiber. Base
shepuryov [24]

Answer:

Explanation:

 For entry of light into tube of unknown refractive index

sin ( 90 - 25 ) / sinr = μ , μ is the refractive index of the tube , r is angle of refraction in the medium of tube

r = 90 - C where C is critical angle between μ and body medium in which tube will be inserted.

sin ( 90 - 25 ) / sin( 90 - C)  = μ

sin65 / cos C = μ

sinC = 1.33 / μ  , where 1.33 is the refractive index of body liquid.

From these equations

sin65 / cos C = 1.33 / sinC

TanC = 1.33 / sin65

TanC = 1.33 / .9063

TanC = 1.4675

C= 56°

sinC = 1.33 / μ

μ = 1.33 / sinC

= 1.33 / sin56

= 1.33 / .829

μ = 1.6   Ans

3 0
3 years ago
The SI unit that is used to measure time is the
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Answer:second

Explanation:

4 0
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A ____________ galaxy has arms of gas and dust; where as _____________ galaxy is a category of galaxy that does not have a disti
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Answer:

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3 years ago
Zoe is shown two mystery boxes that are both 8,000cm3. Her teacher tells her that one mystery box is filled with rocks and the o
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Answer:

The box of rocks will have depression which can be seen without touching the box.

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