सोनार (SONAR) तकनीक नेविगेशन के लिए ध्वनि ऊर्जा का उपयोग करती है, विशेष रूप से पानी के नीचे के वातावरण में। संक्षिप्त नाम 'SONAR' क्या दर्शाता है?

What is the minimum distance a person must stand at from a reflecting surface to hear a distinct echo (assuming speed of sound in air is approximately 344 m/s)?

Sound in the human audible frequency range is commonly referred to as:

Assertion (A): Sound produced from a larger tabla is louder than sound produced from a smaller tabla when struck with equal force. Reason 1 (R1): Loudness increases with an increase in the surface area of the vibrating body. Reason 2 (R2): A larger tabla produces sound of a higher pitch.