define ultrasonography in physics
short short define
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Ʀ૯φυíя૯ɖ Ꭺηsฬ૯я :
☄ ᴜʟᴛʀᴀsᴏᴜɴᴅ ɪs sᴏᴜɴᴅ ᴡᴀᴠᴇs ᴡɪᴛʜ ғʀᴇǫᴜᴇɴᴄɪᴇs ʜɪɢʜᴇʀ ᴛʜᴀɴ ᴛʜᴇ ᴜᴘᴘᴇʀ ᴀᴜᴅɪʙʟᴇ ʟɪᴍɪᴛ ᴏғ ʜᴜᴍᴀɴ ʜᴇᴀʀɪɴɢ. ᴜʟᴛʀᴀsᴏᴜɴᴅ ɪs ɴᴏᴛ ᴅɪғғᴇʀᴇɴᴛ ғʀᴏᴍ "ɴᴏʀᴍᴀʟ" sᴏᴜɴᴅ ɪɴ ɪᴛs ᴘʜʏsɪᴄᴀʟ ᴘʀᴏᴘᴇʀᴛɪᴇs, ᴇxᴄᴇᴘᴛ ᴛʜᴀᴛ ʜᴜᴍᴀɴs ᴄᴀɴɴᴏᴛ ʜᴇᴀʀ ɪᴛ. ᴛʜɪs ʟɪᴍɪᴛ ᴠᴀʀɪᴇs ғʀᴏᴍ ᴘᴇʀsᴏɴ ᴛᴏ ᴘᴇʀsᴏɴ ᴀɴᴅ ɪs ᴀᴘᴘʀᴏxɪᴍᴀᴛᴇʟʏ 20 ᴋɪʟᴏʜᴇʀᴛᴢ ɪɴ ʜᴇᴀʟᴛʜʏ ʏᴏᴜɴɢ ᴀᴅᴜʟᴛs.
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@ɪтzкнυѕнɪ❤~
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