Change in Wave Properties at Different Levels

When a wave travels from one level to another, there are certain changes that occur in its properties. These changes can be observed in the velocity, amplitude, and wavelength of the wave. Let's discuss these changes in detail:

Change in Velocity:
The velocity of a wave is defined as the speed at which the wave propagates through a medium. When a wave travels from one level to another, the velocity of the wave can change. This is because the velocity of a wave depends on the properties of the medium through which it travels. Different levels may have different mediums, such as air, water, or solids, which have different properties and thus can affect the velocity of the wave. Therefore, option (i) is correct.

Change in Amplitude:
The amplitude of a wave is the maximum displacement of particles in the medium from their equilibrium position when the wave passes through them. When a wave travels from one level to another, the amplitude of the wave can also change. This change in amplitude can occur due to various factors such as reflection, refraction, or absorption of the wave energy at the new level. Therefore, option (ii) is correct.

Change in Frequency:
The frequency of a wave is the number of complete cycles or oscillations it completes in a given time. When a wave travels from one level to another, the frequency of the wave remains constant. This is because the frequency of a wave is determined by the source that generates it and does not change as it propagates through different levels. Therefore, option (iii) is incorrect.

Change in Wavelength:
The wavelength of a wave is the distance between two consecutive points in a wave that are in phase. When a wave travels from one level to another, the wavelength of the wave can change. This change in wavelength can occur due to factors such as reflection, refraction, or interference of the wave at the new level. Therefore, option (iv) is correct.

In conclusion, when a wave goes from one level to another, there is a change in the velocity, amplitude, and wavelength of the wave. Therefore, the correct answer is option (c), (i), (ii), and (iv).