The correct option is (ii). A mechanical wave fundamentally requires a material medium to propagate, which is confirmed by the vacuum bell jar experiment where sound cannot travel in a vacuum. Class 9 Science Chapter 10 Sound Waves Characteristics and Applications ...
Discussion Forum Latest Questions
Using speed equals wavelength divided by time period, dividing 3.44 meters by 344 meters per second gives a frequency of 100 Hz, yielding a wave time period of 0.01 seconds. Class 9 Science Exploration New Book All Chapter Solution Revise, Reflect, Refine ...