Dimensional formula of current density
2 answers:
<em>The Dimensional Formula is ![[M ^{-2} A]](https://tex.z-dn.net/?f=%5BM%20%5E%7B-2%7D%20A%5D)
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When we are talking about current density, we are referring to "Ampere per unit area", so the unit we would use is
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When we are talking about current density, we are referring to "Ampere per unit area", so the unit we would use is
Thank you for your question! I hope this helped! Have an amazing rest of your week and feel free to let me know if you need any further help with anything! :D
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Answer:
Cosmic ray's frame of reference: 99,875 years
Stationary frame of reference: 501,891 years
Explanation:
First of all, we convert the distance from parsec into metres:
The speed of the cosmic ray is
where
is the speed of light. Substituting,
And so, the time taken to complete the journey in the cosmic's ray frame of reference (called proper time) is:
Converting into years,
Instead, the time elapsed in the stationary frame of reference is given by Lorentz transformation:
And substituting v = 0.98c, we find: