Why is the sound of thunder clap heard a few seconds later after the flash of lightning is seen?
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The speed of sound in air is just over 300m/s. The noise of thunder is caused by the rapid expansion of heating the air. You can normally hear thunder up to 6 miles (10km) away from the lightning flash. The sound can last quite a few seconds!
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ᴛʜᴇ sᴏᴜɴᴅ ᴏғ ᴛʜᴜɴᴅᴇʀ ᴄʟᴀᴘ ʜᴇᴀʀᴅ ᴀ ғᴇᴡ sᴇᴄᴏɴᴅs ʟᴀᴛᴇʀ ᴀғᴛᴇʀ ᴛʜᴇ ғʟᴀsʜ ᴏғ ʟɪɢʜᴛɪɴɢ ʙᴇᴄᴀᴜsᴇ ʟɪɢʜᴛ ᴛʀᴀᴠᴇʟ ᴍᴏʀᴇ ғᴀsᴛᴇʀ ᴛʜᴀɴ sᴏᴜɴᴅ.....
sᴘᴇᴇᴅ ᴏғ ʟɪɢʜᴛ ɪs :- 3 × 10^8
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