Answer:
(a) 10 nm
(b) 1 Hz
(c) 20 V/m
Explanation
The equation of a progressive wave is given by:
y = Asin(kx ± ωt)
where;
A is the amplitude of the wave in meters
y(x,t) is the displacement in meters
k = 2π/λ is the propagation constant
ω = 2πf is the angular frequency in radian per seconds
The equation now becomes;
y = Asin((2πx)/λ ± 2πft)
(a) Comparing Ey= (20 V/m)sin((6.28x10⁸)x -2πft) with the general equation
(2πx)/λ = 6.28 × 10⁸
λ = 2π / 6.28 × 10⁸
λ = 1.0 × 10⁻⁸ m
λ = 10 × 10⁻⁹ m
λ = 10 nm
(b) Comparing Ey= (20 V/m)sin((6.28x10⁸)x -2πft) with the general equation
2πft = 2πft
f = 1 Hz
(c) Comparing Ey= (20 V/m)sin((6.28x10⁸)x -2πft) with the general equation
A = 20 V/m
The speed of the wave in the rod is
5044m/s
<h3>
What is sound wave?</h3>
A sound wave is the pattern of disruption brought on by the movement of energy moving through a medium as it propagates away from the source of the sound (such as air, water, or any other liquid or solid substance). Pressure waves are produced when an item vibrates, such as a ringing phone, and these waves are known as sound waves. The surrounding medium's particles are disturbed by the pressure wave, and those particles disrupt the particles next to them, and so on. Like ocean waves, the disturbance's pattern causes outward movement in all directions. Usually in all directions and with decreased intensity as it gets further away from the source, the wave transmits the sound energy through the medium.
To know more about sound wave, visit;
brainly.com/question/21995826
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Answer:
The air molecules in the compressions of the second wave are more dense, so the sound is louder.
Explanation:
In a closed room, Noah and Nina are sitting 15 m apart.
As Noah says the same sentence twice, Nina does not hear the sound the first time but she does hear the sentence the second time.
This happens as the air molecules in the compressions of the second wave are more dense. As a result, the sound is louder.
The correct option is ''The air molecules in the compressions of the second wave are more dense, so the sound is louder''