Shadows and Eclipses Shadow demo Eclipses Wikipedia David BallĬlicker Question – Lunar Eclipse What phase is the moon in a few minutes before and a few minutes after a total lunar eclipse? Full moon Exactly half moon New moon Any phase, depending on when the eclipse happens!
Shadows and Eclipses Lunar Eclipse, Wikipedia View from perspective of observer on earth, looking up at moon Light is an electromagnetic wave, so all of this still holds true Carries energy Has momentum (oomph) (but does NOT have mass) In a vacuum travels at “light speed” (duh?) Behaves like particle AND wave (what the?) Many light phenomena can be understood by treating visible light as if it were particles Shadows and Eclipses Lunar Eclipse, Wikipedia Study the crispness of shadows you see outside to see effects of umbra and penumbra But does light carry momentum? Yes, always Sometimes No! Light does NOT have mass! Optical tweezers! Solar sails! JPL But does light carry momentum? Yes, always Sometimes No! Light does NOT have mass! Ĭlicker Question-Light Hopefully you know that light carries energy. Hydrogen clouds on the SunĬlicker Question-Light Hopefully you know that light carries energy.
Today: Shadows, Eclipses, Blackbody Radiation, The Sun (also eliminating some crayon bias) This weekend: more reading, HW question to turn in, quiz for next Thurs.
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