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Bismuth-208, which has an atomic mass of 208u and 83 protons in the nucleus, decays through the emission of 2 alpha particles and a beta-positive particle. What isotope results from this decay?

208 83 Bi ==> x y Z + 4 2 a + 4 2 a + 0 1 B x = 208 - 8 = 200 y = 83 - 5 = 78 Proton number = 78 therefore Z = Pt Z= 200 78 Pt
DL
Answered by Danny L. • Physics tutor
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What are Newton's three laws?

First: an object remains at rest or constant speed unless acted on by an external force Second: Force is equal to rate of change of momentum Third: Every action has an equal and opposite reaction
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Answered by Charlie D. • Physics tutor
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Explain how Maxima and Minima occur in Young's double slit experiment

When coherent, in-phase light passes through two slits they act as seperate sources, these waves diffract and overlap, causing regions of constructive and destructive interference. When they collide with a s...
CD
Answered by Charlie D. • Physics tutor
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You are in a vacuum chamber, and you drop a feather and a bowling ball (initially at rest) from a great height. Which will hit the ground first?

The key fact here is in free fall everything accelerates at the same rate. Acceleration is equal to 9.81 m/s 2 (accleration of free fall). This means provided you drop both at the same height, and drop them ...
OT
Answered by Owen T. • Physics tutor
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Using the substitution u=cosx + 1, show that the integral of sinx e^cosx+1 is equal to e(e-1), for the values of x between x=π/2 and x=0

First we differentiate the substitution giving, du/dx=-sinx, which is rearanged to dx=du/-sinx. we can then substitute this into the integral to get sinx e^cosx+1 du/-sinx which can be simplified to -e^cosx+...
KS
Answered by Kieran S. • Physics tutor
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