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umka2103 [35]
3 years ago
6

Describe how the doppler effect explains why a siren has a lower pitch as a fire engine moves away from you. How does the freque

ncy of a wave relate to the energy of the wave? Write your answers out in your own words please :))

Physics
2 answers:
Elena L [17]3 years ago
5 0
The Doppler effect is the change in sound or light that occurs whenever there is motion between the source and its observer. The siren of the fire engine has a lower pitch as it moves away because the waves are now spread out causing a lower frequency and a lower pitch. High-frequency sound waves have a higher pitch and higher energy than low-frequency waves. 
Anna71 [15]3 years ago
5 0

Answer:

<u>Sirens lower pitch when the fire engine moves away:</u>

When the fire engine(the source) moves away from the listener, there is a change or decrease in frequency, f of the sound produced by the fire engine.

Because, when there is a change in the distance, d between the listener and the source of the sound there is always a change in the frequency or the pitch of the sound. As the source of the sound comprises a given field in which the intensity of the sound produced is much more effective, then the person standing outside that field.

<u>Source of the Sound, when the source is leaving:</u>

  • f₁=a/a+U,
  • And the sound pitch will be low,  f₁∠f.

<u>Sound source approaching towards the listener:</u>

  • fa=f×(a/a-U),
  • And the pitch of the sound will be of high value as, f∠fa.

Explanation:

<u>Doppler effect: </u>

"The Doppler effect is the change in the frequency,f level between the listener and the source. As the difference between the intensity or level of frequency,f is due to the increase and decrease of the distance between the listener and the source."

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slava [35]

Answer:

The angular speed of the wheel is 0.452 rad/s

Explanation:

The angle through which the car wheel turns, Δθ = 277° = 277/360 × 2·π radian

The time it takes for the car wheel to turn, Δt = 10.7 s

The angular speed, ω is given by the following equation;

Angular \ speed = \dfrac{Change \ in \ angular \ rotation }{Change \ in \ time} = \dfrac{\Delta \theta}{\Delta t}

Substituting the known values for Δθ and Δt gives;

Angular \ speed = \dfrac{\dfrac{277 ^{\circ}}{360 ^{\circ }  }  \times 2 \times \pi \ radian}{10.7 \ seconds} \approx 0.452 \ rad/s

The angular speed of the wheel = 0.452 rad/s

3 0
3 years ago
How many cubic objects of volume 2cm cube can be started in a room of dimension 2m by 3m by 4m​
jenyasd209 [6]

Answer:

12,000,000 boxes

Explanation:

the volume of the room can be found by using the equation for volume of a rectangular box:V=LxWxH

where:

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(it doesn't really matter which is which since it is multiplication)

when we multiply our values (2m*3m*4m) we get 24cubic meters

now we need to convert cubic meters to cubic centimeters

each cubic meter is 1,000,000 cubic centimeter we multiply 24 by 1,000,000 and we get: 24,000,000 cubic centimeters (cc)

dividing 24,000,000 by 2 (since each box is 2cc) we get 12,000,000

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8 0
3 years ago
Energy from the sun is _energy
olganol [36]
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So energy from the sun is solar energy.
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4 0
4 years ago
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Chapter 05, Problem 15 Multiple-Concept Example 7 and Concept Simulation 5.2 review the concepts that play a role in this proble
Llana [10]

Answer:

Explanation:

The question relates to motion on a circular path .

Let the radius of the circular path be R .

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R = v² /μg

= 26.8 x 26.8 / .335 x 9.8

= 218.77 m

In case of moton of car B

mv² / R = μmg

v²  = μRg

= .683  x 218.77x 9.8

= 1464.35

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schepotkina [342]

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3 0
3 years ago
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