Edexcel A Level Physics:復習筆記10.8 Cosmology
The Hubble Constant By rearranging the equation for Hubble’s law, we can determine that the Hubble constant,?H0, is: Where: v?= recessional velocity of an object (km s–1) d?= distance between the o...
Edexcel A Level Physics:復習筆記10.7 Equations for Cosmology
Redshift Equation Recall the Doppler effect is defined as: The apparent change in wavelength or frequency of the radiation from a source due to its relative motion away from or toward the observer ...
Edexcel A Level Physics:復習筆記10.6 Doppler Shift
Doppler Shift If a wave source is stationary, the wavefronts spread out?symmetrically If the wave source is moving, the waves can become?squashed?together or?stretched?out If the wave source is mov...
Edexcel A Level Physics:復習筆記10.5 The Life Cycle of Stars
The Life Cycle of Stars The life cycle of stars go in predictable stages The exact route a star's development takes depends on its initial mass Initial Stages for All Masses The first four stages i...
盤點Alevel課程A*高分及最難的科目！
近些年，越來越多的家長意識到國際教育的重要性，A-level課程也成為眾多家長和學生的首選。今天就為大家盤點一下，Alevel課程A*高分及最難的科目，為進入世界頂級學府做準備。 Alevel的A*標準 Alevel的每一科考試...
Edexcel A Level Physics:復習筆記10.4 The Hertzsprung-Russell Diagram
The Hertzsprung - Russell Diagram Danish astronomer Ejnar Hertzsprung, and American astronomer Henry Noris Russell, independently plotted the?luminosity?of different stars against their?temperature...
Edexcel A Level Physics:復習筆記10.3 Standard Candles
Determining distance using standard candles Standard Candles A standard candle is defined as: An astronomical object which has a known luminosity due to a characteristic quality possessed by that c...
Edexcel A Level Physics:復習筆記10.2 Parallax
Determining Distance using Parallax The?principle of parallax?is based on how the position of an?object?appears to change as the position of the?observer?changes For example, when?observing?the sca...
Edexcel A Level Physics:復習筆記10.1 Inverse Square Law of Flux
Inverse Square Law of Flux The moment the light leaves the surface of the star, it begins to spread out uniformly through a spherical shell Light sources which are further away appear fainter becau...
