The working system of radar is based on reflection of radio waves. Radar (Radio Detection and Ranging) uses radio waves transmitted from an antenna. These waves are directed towards an object, and some of them reflect back to the radar ...
Discussion Forum Latest Questions
To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source of 17 meters. This distance ensures that the time delay between the original sound and its reflected sound is perceptible to ...
The cause of echo is reflection of sound. When sound waves encounter a smooth and hard surface, such as a wall or cliff, they bounce back towards the source. If the reflected sound reaches the listener’s ears distinctively after the ...
The velocity of sound in air increases with increasing temperature. This is because warmer air has more energy, causing air molecules to move faster and transmit sound waves more quickly.
The speed of sound is maximum in solids due to their tightly packed molecules, which facilitate faster sound wave transmission. Among the options, iron has the highest density and rigidity, leading to the fastest speed of sound. Therefore, at 20 ...