AQA A Level Physics復習筆記8.3.4 Nuclear Radius
Estimating Nuclear Radius Closest Approach Method In the Rutherford scattering experiment, alpha particles are fired at a thin gold foil Some of the alpha particles are found to come straigh...
AQA A Level Physics復習筆記8.3.3 Nuclear Excited States
Nuclear Excited States In the same way that electrons can exist in excited states, nuclei can also exist in?excited states After an unstable nucleus emits an alpha particle, beta particle or...
AQA A Level Physics復習筆記8.3.2 Decay Equations
Changes in N and Z by Radioactive Decay There are four reasons why a nucleus might become unstable, and these determine which decay mode will occur Too many neutrons Decays through?beta-minu...
IB DP Maths: AA HL復習筆記4.6.3 Standardisation of Normal Variables
Standard Normal Distribution What is the standard normal distribution? The?standard normal distribution?is a normal distribution where the?mean is 0?and the?standard deviation is 1Why is the standa...
不參與U.S.News排名，但實力強勁的美國大學有哪些？
在美國有相當一部分院校是不參與U.S.News排名的，原因各不相同，而作為申請者，如果在選校時忽略了這些“無名”但實力強勁的學校，很有可能會與自己真正的夢校擦肩而過。今天小編來聊聊那些長期被忽視，但學術實力...
AQA A Level Physics復習筆記8.3.1 Nuclear Instability
Nuclear Stability Graph The most common elements in the universe all tend to have values of N and Z less than 20 (plus iron which has Z = 26, N = 30) Where: N = number of neutrons Z = number...
AQA A Level Physics復習筆記8.2.4 Applications of Radioactivity
Radioactive Dating The isotope carbon-14 is commonly used in radioactive dating It forms as a result of cosmic rays knocking out neutrons from nuclei, which then collide with nitrogen nuclei...
AQA A Level Physics復習筆記8.2.3 Half-Life
Half-Life Half-life is defined as: The time taken for the initial number of nuclei to halve for a particular isotope This means when a time equal to the half-life has passed, the?activity?of...
AQA A Level Physics復習筆記8.2.2 Exponential Decay
Exponential Decay In radioactive decay, the number of undecayed nuclei falls very rapidly, without ever reaching zero Such a model is known as?exponential decay The graph of number of...
