Question 1 What does the working of a toy telephone tell us about sound? Question 2 Name one solid, liquid and a gas through which sound can travel? Question 3 Why sound cannot travel through vacuum? Question 4 Define the term medium? Question 5 How can you show that sound cannot travel vacuum? Question 6 Why sound cannot be heard on the moon? Question 7 How … [Read more...] about Sound needs a medium for Propagation