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AegisFLCL
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Homework Statement
(a) The ratio v/c is very often denoted by the single symbol β. Show that if β<<1, the following are valid through terms of order β^2
E = mc^2 + (mv^2)/2 = (mc^2)[1+(β^2)/2]
K = (mv^2)/2 = (mc^2)[(β^2)/2]
pc = mvc = m(c^2)β
γ = 1+(β^2)/2
(b) Show that if γ = ε^-1 >> 1, the following are valid through terms of order ε^2
β = 1-(ε^2)/2
E = (ε^-1)*m*c^2
K/E = 1-ε
pc/E = 1-(ε^2)/2
K/pc = 1-ε+(ε^2)/2
Homework Equations
Either none are necessary or I am missing something...
The Attempt at a Solution
First I'm not entirely clear on what the question is asking (especially part b). Am I supposed to substitute in some arbitrary value that goes along with the statement or are they simply asking for algebraic solutions? If someone could clarify and provide hints it would be much appreciated. I did try the first part of part a however.
E = mc^2 + (mv^2)/2 = (mc^2)[1+(β^2)/2]
mc^2 + (mv^2)/2 = (mc^2)[1+(β^2)/2]
1+(β^2)/2 = 1+[(mv^2)/2]/(mc^2)
(β^2)/2 = [(mv^2)/2]*(mc^2)^-1
β^2 = (mv^2)/(mc^2)
β = v/c