Question

PLZ ANSWER THIS QUESTION❣

Answer 1

ᴛʜᴇ ᴘʀᴏᴘᴇʀᴛʏ ᴡʜɪᴄʜ ʟᴇᴀᴅs ᴛᴏ ᴛʜᴇ 
ғᴏʀᴍᴀᴛɪᴏɴ ᴏғ ᴇᴄʜᴏᴇs ɪs ʀᴇғʟᴇᴄᴛɪᴏɴ 
ᴏғ sᴏᴜɴᴅ. 

ᴡʜᴇɴ ᴀ sᴏᴜɴᴅ ɪs ʀᴇᴘᴇᴀᴛᴇᴅʟʏ 
ʀᴇғʟᴇᴄᴛᴇᴅ ᴀɴᴅ ɪғ ᴍɪɴɪᴍᴜᴍ 
ᴅɪsᴛᴀɴᴄᴇ ʙᴇᴛᴡᴇᴇɴ sᴏᴜɴᴅ 
sᴏᴜʀᴄᴇs ᴀɴᴅ ʀᴇғʟᴇᴄᴛɪɴɢ 
sᴜʀғᴀᴄᴇ ɪs ᴍᴏʀᴇ ᴛʜᴀɴ 17.2 ᴍ, 
ᴛʜᴇɴ ᴡᴇ ʜᴇᴀʀ ᴇᴄʜᴏᴇs.

ɪғ ᴛʜᴇ ʀᴇᴠᴇʀʙᴇʀᴀᴛɪᴏɴ ᴛɪᴍᴇ ɪɴ ᴀ 
ʙɪɢ ʜᴀʟʟ ɪs ᴛᴏᴏ ʟᴏɴɢ, ᴛʜᴇɴ 
sᴏᴜɴᴅ ʙᴇᴄᴏᴍᴇs ᴅɪsᴛᴏʀᴛᴇᴅ, 
ʙʟᴜʀʀᴇᴅ ᴀɴᴅ ᴄᴏɴғᴜsɪɴɢ.

thanks...

Answer 2

Sound is a wave , it needs a medium to travel ... so it's direction and velocity is dependent on medium that is, it reflects(changes its path) when it fall on a hard surface and this leads to the formation of echoes ...therefore we can say that the property of reflection of sound leads to the formation of echoes...
time taken= 2 times (distance between source of sound and point of reflection of sound) ÷ velocity of sound