The absolute refractive index is equal to the speed of light of the wave in air divided by the speed of light in the second medium. This means that it is equal to 3 x10^8 / 1.71 x10^8. This means the answer is 1.75
The speed will increase four (4) times when the frequency of sound wave is increased four (4) times.
<h3>How to calculate the
frequency of a
wave.</h3>
Mathematically, the frequency of a sound wave is given by this formula:

<u>Where:</u>
- F is the frequency of a sound wave.
- V is the velocity of a sound wave.
is the wavelength of a sound wave.
<u>Note:</u> The frequency of the sound wave is increased four (4) times.
Substituting the given parameters into the formula, we have;

Therefore, the speed will increase four (4) times when the frequency of sound wave is increased four (4) times.
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Answer: C
Explanation: i hoped that helped!
The answer is 
=
Thus, the average flow rate is
.
What is average flow rate?
- Average flow, which is often represented in cubic feet per second, refers to the stream's average discharge at a certain location.
- The flowrate is the rate at which liquid travels through a pipe or into a wellbore from a reservoir.
- The volume of fluid that moves across a specific cross-sectional area per unit of time is known as the flow rate.
- It is essential to measure flow rates accurately using the right flowmeters to guarantee that fluid management procedures are efficient, safe, and cost-effective.
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Answer:
Explanation:you know
circumference of a circle =2*pi*r=?
r=radius of a circle =3m
total distance of 6 revolution =s=6*2*pi*r
again, linear speed =v=s/t=?
t=time =60sec