अप्रगामी तरंगों (standing waves) को प्रदर्शित करके किसी गैस या ठोस छड़ में ध्वनि की गति निर्धारित करने के लिए पारंपरिक रूप से निम्नलिखित में से किस प्रयोगात्मक उपकरण/विधि का उपयोग किया जाता है?

How does the speed of sound in air change with an increase in temperature?

The apparent change in the frequency of sound due to relative motion between the source and the observer is known as:

A whispering gallery is an acoustic-architectural feature in which sound waves are conveyed along the curved surface of a structure, making a low sound audible across a distance. With reference to this phenomenon, consider the following monuments: I. Gol Gumbaz II. Victoria Memorial III. Rani ki Vav Which of the monuments feature a whispering gallery?