Why is an echo weaker than the original
sound?
1. The echo has a shorter wavelength than
the original sound due to the reflection.
2. The echo has a smaller amplitude than
the original sound because sound spreads and
its intensity decreases with distance.
3. The echo has a longer wavelength than
the original sound due to the reflection.
4. The echo has a higher frequency than the
original sound due to the reflection.
kkkn
Answer is number 3
The correct answer to the question is 2. The echo has a smaller amplitude than the original sound because sound spreads and its intensity decreases with distance.
To understand why an echo is weaker than the original sound, we need to consider a few factors. First, let's understand what an echo is. An echo occurs when sound waves are reflected off a surface, such as a wall or a cliff, and then travel back to the listener.
When the original sound waves reach the reflecting surface, some of the energy is absorbed by the surface, and the remaining energy is reflected back. This reflection introduces a delay between the original sound and the echo. The reflected sound waves then travel back towards the listener.
During the journey back to the listener, the sound waves disperse and spread out. This phenomenon is known as sound attenuation or sound spreading. The spreading of the sound waves results in a decrease in the intensity or energy of the sound. In other words, the amplitude of the echo becomes smaller than the original sound.
The spreading of sound waves occurs due to several factors, including the air molecules absorbing some of the sound energy, the interaction with other objects, and the effects of diffraction. As the sound waves travel through the air, they lose energy, causing the echo to be weaker than the original sound.
Therefore, the correct explanation for why an echo is weaker than the original sound is that sound spreads and its intensity decreases with distance. This decrease in amplitude or intensity is responsible for the perceived weakness of the echo compared to the original sound.