<h2>
Answer: Doppler effect
</h2>
Explanation:
A radar gun (also known as a Doppler radar) uses the Doppler effect when measuring "return echoes" after having sent a microwave signal (a type of electromagnetic radiation).
In this context the Doppler effect consists of the change in a wave perceived frequency when the emitter of the waves, and the observer move relative to each other.
In the case of radars, a microwave signal is sent to a target (the tennis or baseball in this case) and then is reflected after "hitting" the target, so that the radar system measures this difference between the sent signal and the reflected signal.
Answer:
Wind - the perceptible natural movement of the air, especially in the form of a current of air blowing from a particular direction. Sound wave - a wave of compression and rarefaction, by which sound is propagated in an elastic medium such as air.
Sound wave travels faster in the air when it is with the wind. ... In contrast, when sound wave travels against the wind, that is, when it travels in the opposite direction with the wind, the speed of sound will be reduced by the wind speed, resulting in a lower speed in the upper region.
Explanation:
please mark me brainliest
You would have to subtract the mass number with atomic number which will give you 119 number of neutrons.
Answer:
308 m/s
Explanation:
In a closed tube, the length of the tube (L) is related to the wavelength of the standing wave (
) by the relationship
In this problem, the length of the tube is L=20 cm=0.20 m, so we can find the wavelength of the standing wave:
And no we can find the speed of the sound wave by using the following equation:
where 
is the frequency of the wave. So, we find
