Q6 short answers and clear font and positron (m 9.11x10akg,+1.6x10 C) are sponta

Question

Q6 short answers and clear font

and positron (m 9.11x10akg,+1.6x10 C) are spontaneously created. With a field applied inte the page, the trajectories of the created positron and electron are shown below ó. When a high-energy gamma ray is absorbed by matter, an electron (m-g.1xiowkg,q-1.610C) Field A. Is the field used to create the image an electric field or a magnetic field? Explain. B. Explain which of the labeled trajectories (A and B) is for the electron and which is for the positron C. Immediately after they are created, explain whether the electron or the positron is traveling faster. D. Explain whether the particles speed up, slow down, or move at constant speed.

Explanation / Answer

A)The field used for image is Magnetic field. Because as seen the moving charged particles follow a circular path, which happens when they are under the influence of magnetic field. The magnetic force balances the net centripital force.

B)Since the field is pointing into the page, the positive charge will get deflected in the anticlockwise direction and negative will get deflected in clockwise direction.

So, A is electron and B is positron.

C)The acceleration potential be V and will be same for both the charges.

from conservation of energy

1/2 m v^2 = e V

v = sqrt (2 e V/m)

but m and e are same for the electron and positron. So they will have the same speed.

D)Its a fact that the presence of B field do not change the speed of the charged particle, it just alters the path to a circular path. Hence they move at constant speed.

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