Edexcel A Level Physics:复习笔记11.4 Nuclear Fusion
Nuclear Fusion Fusion is defined as: Small nuclides that combine together to make larger nuclei, releasing energy Low mass nuclei (such as hydrogen and helium) can undergo fusion and release energy...
Edexcel A Level Physics:复习笔记11.3 Binding Energy per Nucleon Graph
Binding Energy per Nucleon Graph When comparing the stability of different nuclei, it is useful to look at the binding energy per nucleon The binding energy per nucleon is defined as: The binding e...
Edexcel A Level Physics:复习笔记11.2 Atomic Mass Unit
Atomic Mass Unit The unified atomic mass unit (u or sometimes a.m.u) is roughly equal to the mass of one proton or neutron: 1 u = 1.66 × 10−27 kg This value is provided on the exam data sheet The a...
Edexcel A Level Physics:复习笔记11.1 Nuclear Binding Energy & Mass Deficit
Nuclear Binding Energy Experiments into nuclear structure have found that the total mass of a nucleus is less than the sum of the masses of its constituent nucleons This difference in mass is known...
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...
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...
