State and explain photoelectric effect?
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Pʜᴏᴛᴏᴇʟᴇᴄᴛʀɪᴄ ᴇғғᴇᴄᴛ, ᴘʜᴇɴᴏᴍᴇɴᴏɴ ɪɴ ᴡʜɪᴄʜ ᴇʟᴇᴄᴛʀɪᴄᴀʟʟʏ ᴄʜᴀʀɢᴇᴅ ᴘᴀʀᴛɪᴄʟᴇs ᴀʀᴇ ʀᴇʟᴇᴀsᴇᴅ ғʀᴏᴍ ᴏʀ ᴡɪᴛʜɪɴ ᴀ ᴍᴀᴛᴇʀɪᴀʟ ᴡʜᴇɴ ɪᴛ ᴀʙsᴏʀʙs ᴇʟᴇᴄᴛʀᴏᴍᴀɢɴᴇᴛɪᴄ ʀᴀᴅɪᴀᴛɪᴏɴ. Tʜᴇ ᴇғғᴇᴄᴛ ɪs ᴏғᴛᴇɴ ᴅᴇғɪɴᴇᴅ ᴀs ᴛʜᴇ ᴇᴊᴇᴄᴛɪᴏɴ ᴏғ ᴇʟᴇᴄᴛʀᴏɴs ғʀᴏᴍ ᴀ ᴍᴇᴛᴀʟ ᴘʟᴀᴛᴇ ᴡʜᴇɴ ʟɪɢʜᴛ ғᴀʟʟs ᴏɴ ɪᴛ.
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