IX Class Question solution for Physics Chapter Sound 1. How sound is produced? Answer: Sound is produced by the vibration of vibrating object. 2. What do you understand by a ‘wave’? Answer: A periodic disturbance created in material medium that transfer sound and light energy is called wave. 3. Write three differences between sound and light waves. Answer: sound wave is Mechanical wave that require material medium for propagation where as light waves are electromagnetic wave that can travel in vacuum. 4. What do you understand by “sound energy cannot be produced”? Answer: Sound energy cannot be produced on its own. Some mechanical energy is required to make an object vibrate. It is the mechanical energy of the vibrating object which travels through a medium and ultimately reaches the ear. 5. What is the name of the wave that can travel through vacuum? Answer: Electromagnetic wave 6. Explain by some experiment that sound waves require medium for their
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