B. longitudinal.
C. transverse.
D. forced.
Rarefaction occurs only in a longitudinal wave.
A light beam refracts whenever it reaches an angled material with a different refractive index. A change in direction results from this acceleration. As an example, consider air entering the water. The speed of the light decreases as it continues to travel at a changingangle.
Transverse waves do not experience rarefaction, which is a phenomenon that only happens in longitudinal waves.
This is due to the fact that longitudinal waves cause the medium through which they travel to be compressed and rarefied.
Transversewaves, however, feature oscillations that are parallel to the direction of the wave.
With a longitudinal wave, the medium's particles are moved along with the wave in the same direction.
Both zones of compression and rarefaction result from this, with the former having the particles closer together than they would be in their equilibrium state.
The wave is produced by the pattern of compression and rarefaction.
Due to the displacement of the medium's particles in the same direction as the wave's propagation, rarefaction only happens in longitudinal waves, where it results in places where the particle spacing is greater than it would be in the equilibrium state.
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The correct answer to the question is : B) Longitudinal wave.
EXPLANATION:
Before coming into any conclusion, first we have to understand the nature of sound wave.
The sound wave is a longitudinal wave in which the direction of vibration of particles are parallel to the direction of wave propagation.
In this type of wave, one will find compression and rarefaction. Compression is the high pressure region in which the particles are closely aggregated to each other.
Rarefaction is the low pressure region in which the particles are far away from each other. There is large separation between particles as compared to compression.
Hence, the correct answer is sound wave.
The time of the bottle would take to land if it were to fall the same distance on the moon instead of Earth is 12.12 seconds.
To find the Time, the given values are,
A bottle lying on the windowsill fall = 4.95 seconds
The distance of the object to the ground = 120 meters
The distance d an object falls under the influence of gravity is determined by the equation
D = (1/2) (g) (t²)
where,
D - Distance
g - acceleration of gravity
t²- square of the falling time
In the equation,
Multiply each side by 2 : 2 D = gt²
Divide each side by ' g ' : 2 D/g = t²
Square root each side: t = √ (2D/g)
Gravity on the surface of the moon is roughly 1/6 the value
of gravity on the surface of the Earth.
So we expect ' t ' to increase by √6 = 2.45 times.
It would take the same bottle (2.45 x 4.95) = 12.12 seconds
to roll off the same window sill and fall 120 meters down to the surface of the Earth.
Thus, the time of the bottle would take to land if it were to fall the same distance on the moon instead of Earth is 12.12 seconds.
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The right answer is 280 N.
When a woman stands with two feet on a scale, the scale reads 280 N and when she lifts one foot, the scale also reads 280 N because the weight of the other leg also comes on the one leg.
First, the whole weight of the body depends on two feet but when the second feet is lifted, the weight of the whole body including the lifted feet comes on the single feed so we can conclude that the right answer is 280 N
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Correct answer choice is :
C) Low ratios of the frequencies of the original and resultant waves indicate discordant waves.
Explanation:
The sound is created when something vibrates. The vibrating body makes the means around it to vibrate. Vibrations in the air are described going longitudinal waves, which we can hear. Sound waves consist of regions of high and low pressure named compressions and rarefactions. The left ventricle will ultimately lose as depolarization opens from the right ventricle, but the stay in conduction effects in a wide QRS system. In the appearance of LBBB, the T wave should be discordant or diverted opposite the final deflection of the QRS system.