The loudness of a sound relates the intensity of any given sound to the intensity at the threshold of hearing. It is measured in decibels (dB).

Bouncing back of sound wave from the surface of solid or liquid is called reflection of sound. Reflection of sound follows the Laws of Reflection as light wave does. This means the angle of incident wave and reflected wave to the normal are equal.

The loudness of a sound depends on the amplitude of the wave. The loudness of sound is proportional to the square of the amplitude. The loudness of sound also depends on the sensitivity of the human ear. Note: Loudness is the measure of how strong a sound wave is at the place.

Summary

• Loudness refers to how loud or soft a sound seems to a listener.
• As decibel levels get higher, sound waves have greater intensity and sounds are louder.
• Intensity of sound results from two factors: the amplitude of the sound waves and how far they have traveled from the source of the sound.

What two factors affect the loudness of a sound? The amount of energy it takes to make the sound, and the distance from the source of the sound.

• properties of medium through which it travels .
• temperature of medium increases with increasing temperature.
• humidity of air.

Answer. Answer: For simple mechanical waves like sound, intensity is related to the density of the medium and the speed, frequency, and amplitude of the wave.

a repetition of sound produced by the reflection of sound waves from a wall, mountain, or other obstructing surface. a sound heard again near its source after being reflected.

Set Up Your Echo

1. Plug in your device.
2. Open the Alexa app .
3. Open More and select Add Device.
4. Select Amazon Echo.
5. Select Echo, Echo Dot, Echo Plus and more. Follow the instructions to set up your device.

An echo is sound which is repeated. This is because sound is reflected back. Example- If we stand on top of mountain and shout our name. We hear the repetition of our sound.

Answer: An echo is heard when the time interval between the original sound and the reflected sound is at least 0.1 s. The speed of sound in a medium increases with an increase in temperature.

If a sound is made in a big hall,the sound waves are reflected repeatedly from walls,ceiling and floor of hall,and produces many echoes. The persistence of sound in big hall due to repeated reflections from walls,ceiling,floor of the hall is called reverberation.