bubble Chamber 1. Certain types of bubble chambers are filled with liquid hydrog
ID: 2065052 • Letter: B
Question
bubble Chamber 1. Certain types of bubble chambers are filled with liquid hydrogen. when a particle (such as an electron or a proton) passes through the liquid, it leaves a track of bubbles, which can be photographed to show the path of the particle. The apparatus is immersed in a known magnetic field, which canses the particle to curve. figure is a trace of a bubble chamber image showing the path of an electron, (a) How could you determine the sigh of the charge of a particle from a photograph of its path? (b) How can physicists determine the momentum and the speed of this electorn by using measurements made on the photograph, given that the magnetic field is known and is perpendicular to the plane of the figure? (c) the electron is obviously spiraling into smaller and smaller circles. what properties of the electron must be changing to cause this behavior? Why does this happen? (d) What would be the path of a neutron in a bubble chamber?Why?
Figure is just a circle
Explanation / Answer
a)
We can determine the sigh of the charge of a particle from right hand rule. For example in the below figure, the rotation is counterclockwise for a positive charge. If q were negative, the rotation would be clockwise.
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b)
F = mv2 /r
e V B = mV2 /r
>>>> V = r*e*B/m
>>>> momentum = p = m*V >>>> p = r*e*B
(e = 1.6 * 10^-19 C)
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c)
The velocity of the electron decreases.
Any charged particle passing through the liquid in this state leaves behind a trail of tiny bubbles as the liquid boils in its wake. So the electron looses energy during this boiling.
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d)
Neutron has no electrical charge, so it's path is a straight line
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