Questions with the keyword 'sound'

• Why are there echoes? by whjamieandrhys to Anil, Blanka, Cees, Emma, Mike Comments: (No comments so far )
• how do you break the sound barrier twice by whkevandcam to Anil, Blanka, Cees, Emma, Mike Comments: (No comments so far )
• How fast is the speed of light compared to the speed of sound? by asiansupreme to Anil, Blanka, Cees, Emma, Mike Comments: (No comments so far )