Question

why is the thunder sound heard after the flash of lightning​

Answer 1

ɪᴍᴍᴇᴅɪᴀᴛᴇʟʏ ᴀғᴛᴇʀ ᴛʜᴇ ғʟᴀsʜ, ᴛʜᴇ ᴀɪʀ ᴄᴏᴏʟs ᴀɴᴅ ᴄᴏɴᴛʀᴀᴄᴛs ǫᴜɪᴄᴋʟʏ. ᴛʜɪs ʀᴀᴘɪᴅ ᴇxᴘᴀɴsɪᴏɴ ᴀɴᴅ ᴄᴏɴᴛʀᴀᴄᴛɪᴏɴ ᴄʀᴇᴀᴛᴇs ᴛʜᴇ sᴏᴜɴᴅ ᴡᴀᴠᴇ ᴛʜᴀᴛ ᴡᴇ ʜᴇᴀʀ ᴀs ᴛʜᴜɴᴅᴇʀ. ᴀʟᴛʜᴏᴜɢʜ ᴀ ʟɪɢʜᴛɴɪɴɢ ᴅɪsᴄʜᴀʀɢᴇ ᴜsᴜᴀʟʟʏ sᴛʀɪᴋᴇs ᴊᴜsᴛ ᴏɴᴇ sᴘᴏᴛ ᴏɴ ᴛʜᴇ ɢʀᴏᴜɴᴅ, ɪᴛ ᴛʀᴀᴠᴇʟs ᴍᴀɴʏ ᴍɪʟᴇs ᴛʜʀᴏᴜɢʜ ᴛʜᴇ ᴀɪʀ.❤

Answer 2

Answer:

Immediately after the flash, the air cools and contracts quickly. This rapid expansion and contraction creates the sound wave that we hear as thunder. Although a lightning discharge usually strikes just one spot on the ground, it travels many miles through the air.