Which one of the following parameter of a wave does not change when it transmits through two different media:

Explanation

(a) Amplitude: The amplitude of a wave represents the maximum displacement or intensity of the wave. It can change when a wave transmits through different media. For example, the amplitude of sound may decrease as it travels through air to reach our ears. (b) Velocity: The velocity of a wave, which is the speed at which it travels, can change when it transmits through different media. The speed of sound, for instance, varies depending on the medium it travels through. It is faster in solids than in liquids or gases. (c) Frequency: When sound travels from air to water, the speed of sound changes because the properties of the medium are different. This change in speed affects the wavelength of the sound wave. However, the frequency of the sound wave, which determines its pitch, remains the same. So, whether the sound is in air or water, its frequency remains constant. (d) Wavelength: The wavelength of a wave is the distance between two consecutive points in a wave that are in phase. It can change when a wave transmits through different media. For example, the wavelength of light can change when it passes from air to water. So, the parameter that remains constant when a wave transmits through two different media is (c) frequency.