प्रति इकाई समय में ध्वनि तरंग के कंपनों की संख्या को ________ में मापा जाता है।

The second overtone of an open organ pipe has the same frequency as the first overtone of a closed organ pipe of length L. The length of the open pipe will be:

A siren on a tall pole radiates sound waves uniformly in all directions. At a distance of 15 m from the siren, the sound intensity is 0.250 W/m2. The intensity of sound at a distance of 75 m from the siren is: