Answer: v = (33320 - 340f2)/( f2 + 98)
Explanation: this question refers to Doppler effect, hence,
f1 = { V / (V - v)} x f2
f1 = 98Hz, f2 = 76 Hz, V = 340m/s, v = ?, fs = fsourcs
For f1,
98 = { 340 / (340 + v)} x fs ...(i)
for f2,
f2 = { 340 / (340 - v)} x fs ... (ii)
Divide (ii) by (i)
98/f2 = [{ 340 / (340 + v)} x fs]÷ [ 340 / (340 - v)} x fs]
98/f2 = {340 / (340 + v)} x fs x (340 - v)} / 340 x fs
98/f2 = (340 + v)/ (340 - v)
Cross multiplying
98(340 - v) = f2 (340 + v)
33320 - 98v = 340f2 + vf2
Collecting like terms
vf2 +98v = 33320 - 340f2
v(f2 +98) = 33320 - 340f2
v = (33320 - 340f2)/( f2 + 98)
Answer: relative motion between observer and the sound source.
Explanation: The Doppler effect states that when there is a relative motion between an observer and a sound source the frequency of sound perceived by the observer is different in frequency from the original from the source.
The mathematical back up for this claim is given below.
f' = (v+v') /(v-vs) × f
Where f' = observed frequency
v = speed of sound in air
v' = velocity of observer
vs = velocity of source
f = frequency of sound source.
From the formulae, it can be seen that a change in the value of the velocity of observer (v') and source (vs) produces different value of observed frequency (f').
Note, frequency of sound (f) is a constant.
Answer:
The dilation of time.
The falling of objects.
The changing of paths of light.
Explanation:
I have explained in the image attached below.
From the explanation, the correct ones are;
The dilation of time.
The falling of objects.
The changing of paths of light.
Answer:
Explanation:
wave motion is defined as the propagation of the disturbance due to continous vibration of the molecules of the medium. Waves oduced due to disturbance carry only energy but not the matter.
The waves move water up and down and carry the energy.
Therefoe, the statement "(a) The waves carry water outward away from where the rock hit. The moving water carries energy outward"is incorrect.
The waves move water up and down and carry the energy, but not matter.
Therefore, the statement "(c) The waves ony make the water move u and down. No energy is carried outward from where the rock hit" is incorrect.
When a rock is droed ito a pd, a disturbance starts from the point where the stone hits the water. The waves produced carry the energy from the starting point toother locatons over a large distance which is not possible by the single molecules of water.
Therefore, the statement "(c) The waves only make the water move up and down, but the waves do carry energy outward away from where the rock hit" is correct.
