Which of these require a medium?

Which of these require a medium?

Mechanical waves require a material medium for their propagation and cease to propagate in the absence of a material medium such as a solid, liquid or gas. Since, sound waves are an example of mechanical waves; thus, they require a medium for their propagation. Thus, option (D) is the correct answer to this question.

How fast a wave is Travelling in a medium?

A medium is any substance or region through which a wave is transmitted. The speed of a wave is dependant on four factors: wavelength, frequency, medium, and temperature. Wave speed is calculated by multiplying the wavelength times the frequency (speed = l * f).

Which waves are used in sonography?

An ultrasound scan uses high-frequency sound waves to create images of the inside of the body. It is suitable for use during pregnancy. Ultrasound scans, or sonography, are safe because they use sound waves or echoes to make an image, instead of radiation.

Does sound requires a medium for propagation?

Sound is a mechanical wave that needs a material medium like air, water, steel, etc., for its propagation. The sound wave is a longitudinal wave, ie., the particles of the medium vibrate in a direction parallel to the direction of the propagation of the wave.

Why do sound waves need a medium to propagate?

Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.

Does light requires a medium for propagation?

We know that light doesn’t need a medium through which to travel because the speed of light is experimentally constant: independent of the movement of the source or detector or the direction in which it travels. Light contrasts with sound, which travels through the air (or some other material medium).