Edexcel A Level Physics:复习笔记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:复习笔记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:复习笔记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:复习笔记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...
盘点Alevel课程A*高分及最难的科目！
近些年，越来越多的家长意识到国际教育的重要性，A-level课程也成为众多家长和学生的首选。今天就为大家盘点一下，Alevel课程A*高分及最难的科目，为进入世界顶级学府做准备。 Alevel的A*标准 Alevel的每一科考试...
Edexcel A Level Physics:复习笔记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:复习笔记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:复习笔记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:复习笔记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...
