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2.1 Pre-Class Lecture duration 19 minutes 54 seconds 2.1 Pre-Class Lecture 2.1 Pre-Class Lecture	2.1 Pre-Class Lecture times energy frequency wavelength photon photons nanometers meters joules lambda light wave 18th 21st 15th seconds sense question point 34th From Leena Nabulsi 0 likes 38 plays 0
ASTR 1523 Lecture 6 duration 52 minutes 30 seconds ASTR 1523 Lecture 6 ASTR 1523 Lecture 6	ASTR 1523 Lecture 6 light radiation wavelengths spectrum wavelength body star sun energy rays temperature reason stars surface dust universe photons eyes albedo planet From Nathan Kaib 0 likes 21 plays 0