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serg [7]
3 years ago
15

A fire engine is rapidly approaching you at a stop light. What happens to the frequency and pitch of the sound as the fire engin

e draws closer? The frequency increases, and the pitch decreases The frequency increases, and the pitch increases The frequency decreases, and the pitch decreases The frequency decreases, and the pitch increases
Physics
1 answer:
ValentinkaMS [17]3 years ago
7 0

Answer:

The frequency increases, and the pitch increases

Explanation:

  • Doppler's law of sound is applicable in such case when the observer or the sound source or both are moving relative to each other.
  • In such a case due to space-time constraint the waveform of the sound adjust themselves so as to obey the law of conservation of energy.

<u>The apparent frequency of the sound for the observer is given by:</u>

f_o=(\frac{s+v_o}{s+v_s} )f ....................................(1)

where:

f_o= observed frequency

f= original source frequency

s= speed of sound

v_s= speed of source relative to the observer (taken negative when approaching towards the observer and vice-versa)

v_o= speed of observer relative to the source (taken negative when moving away from the source and vice-versa)

<u>According to the given situation, eq. (1) becomes:</u>

f_o=(\frac{s}{s-v_s} )f

Since, \frac{s}{s-v_s} >1

Therefore

f_o>f

Pitch is very closely related to the frequency, it means that how fast is the amplitude of sound varying with time.

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Soloha48 [4]

Answer:

Millions of years.

Explanation:

Fossil fuels are fuels formed by natural processes. It involves decomposition of dead and decaying animals, marine and plants for over million years. This some times take more than hundred million years to convert into fuel. This is why they are called non renewable resources of energy. The decomposition of dead plant species forms coal and decomposition animals of land and sea forms crude oil and gas.

4 0
3 years ago
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Please help on this one
mixas84 [53]
Ep=mgh
h= Ep/mg
h=57÷(3.3×9.8)
h= 57÷32.34
h= 1.8m
So; the answer is B. 1.8m
6 0
3 years ago
In an experiment refractive index of glass was observed to be 1.45,1.56,1.54,1.44,1.54and1.53. Calculate mean value of refractiv
Sever21 [200]
The mean may be calculated by summing the values of the refractive index and dividing the sum by the number of experiments. This is:
Mean = (1.45 + 1.56 + 1.54 + 1.44 + 1.54 + 1.53)/6
Mean = 1.51

The mean absolute error is the sum of the absolute values of errors divided by the number of trials:
MAE = (|1.45-1.51|+|1.56-1.51|+|1.54-1.51|+|1.44-1.51|+|1.54-1.51|+|1.53-1.51|)/6
MAE = 0.043

The fractional error is the MAE divided by the actual value:
Fractional error = 0.043 / 1.51
Fractional error = 43/1510

The percentage error is the fractional error multiplied by 100:
Percentage error = 2.85%
7 0
3 years ago
A 1kw electric heater is switched on for ten minutes. how much heat does it produce​
Ainat [17]

H= P × t

1kW= 1000w

10 min = 600s

H= 1000×600=600,000J

=> 143.40kcal

4 0
3 years ago
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Answer:

C?

Explanation:

Please give brainliest.

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