which property of electromagnetic waves do not change in vaccum
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speed..................
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ғʀᴇǫᴜᴇɴᴄʏ ᴀɴᴅ ᴡᴀᴠᴇʟᴇɴɢᴛʜ
sɪɴᴄᴇ ᴀʟʟ ᴇʟᴇᴄᴛʀᴏᴍᴀɢɴᴇᴛɪᴄ ʀᴀᴅɪᴀᴛɪᴏɴ ᴛʀᴀᴠᴇʟs ᴀᴛ ᴛʜᴇ sᴀᴍᴇ sᴘᴇᴇᴅ (ɪɴ ᴀ ᴠᴀᴄᴜᴜᴍ), ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴄʀᴇsᴛs (ᴏʀ ᴛʀᴏᴜɢʜs) ᴘᴀssɪɴɢ ᴀ ɢɪᴠᴇɴ ᴘᴏɪɴᴛ ɪɴ sᴘᴀᴄᴇ ɪɴ ᴀ ɢɪᴠᴇɴ ᴜɴɪᴛ ᴏғ ᴛɪᴍᴇ (sᴀʏ, ᴏɴᴇ sᴇᴄᴏɴᴅ), ᴠᴀʀɪᴇs ᴡɪᴛʜ ᴛʜᴇ ᴡᴀᴠᴇʟᴇɴɢᴛʜ.
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