Week 2.1 - 1 h t t p w w w a s t r o p r i n c e t o n e d u ~ m b r o w n a s t r o p i c e c a r j p g I t a C a r i n a e N e b u l a e 1 M o n

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Unformatted text preview: 1 h t t p : / / w w w . a s t r o . p r i n c e t o n . e d u / ~ m b r o w n / a s t r o p i c / e c a r . j p g I t a C a r i n a e N e b u l a e . 1 M o n d a y , 2 8 J u l y 2 8 2 L i g h t i s • a t r a n s v e r s e e l e c t r o m a g n e t i c w a v e • a p a r t i c l e • o n l y a s m a l l p a r t o f t h e e l e c t r o m a g n e t i c s p e c t r u m 2 M o n d a y , 2 8 J u l y 2 8 3 3 M o n d a y , 2 8 J u l y 2 8 4 T r a n s v e r s e e l e c t r o m a g n e t i c w a v e E = E s i n ( k x- ¡ t ) B = B s i n ( k x- ¡ t ) I = E r m s B r m s μ = 1 2 E B μ = 1 2 E 0 2 c μ = 1 2 c B 0 2 μ ( W a t t s 2 m ) 4 M o n d a y , 2 8 J u l y 2 8 5 A n e l e c t r o m a g n e t i c w a v e a l s o c a r r i e s m o m e n t u m w h i c h l e a d s t o r a d i a t i o n p r e s s u r e . P r = I c ( N m 2 ) 5 M o n d a y , 2 8 J u l y 2 8 6 M o n d a y , 2 8 J u l y 2 8 © P h y s i c s C u r r i c u l u m & I n s t r u c t i o n ( w w w . p h y s i c s c u r r i c u l u m . c o m ) S p e e d o f l i g h t c = ¡ / k = f ¢ = 2 9 9 , 7 9 2 , 4 5 8 m / s ( e x a c t l y f r o m 1 9 8 3 ) P h y s i c s D e m o n s t r a t i o n s i n L i g h t ( 1 . 1 ) 7 M o n d a y , 2 8 J u l y 2 8 W h y a r e a l l T V a n t e n n a s i n t h e I l l a w a r r a h o r i z o n t a l ? P o l a r i s a t i o n P o l a r i s a t i o n r e f e r s t o t h e d i r e c t i o n o f t h e e l e c t r i c v e c t o r ( E ) L i g h t i s e i t h e r p o l a r i s e d o r u n p o l a r i s e d E x z E 8 M o n d a y , 2 8 J u l y 2 8 9 L i g h t f r o m c o m m o n s o u r c e s a r e s a i d t o b e u n p o l a r i s e d o r n a t u r a l . T h e r e i s n o f i x e d p h a s e r e l a t i o n o r d i r e c t i o n o f E b e t w e e n a n y o f t h e w a v e s ....
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This note was uploaded on 08/20/2010 for the course PHYS 142 taught by Professor Xxx during the One '09 term at University of Wollongong, Australia.

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Week 2.1 - 1 h t t p w w w a s t r o p r i n c e t o n e d u ~ m b r o w n a s t r o p i c e c a r j p g I t a C a r i n a e N e b u l a e 1 M o n

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