Problem 7: An alpha particle (consisting of two protons and two neutrons), traveling at a speed of v = 1.4 x 105 m/s, enters a region of constant magnetic fi eld of strength B = 1.8 T as shown in the fi gure. The direction of B is out of the image. The alpha follows a path that is a circular arc of radius r. Part (a) In atomic mass units, what is the mass m of an alpha particle? Part (b) In units of elementary charge e, what is the electric charge q of an alpha particle? Part (c) In meters, what is the radius of curvature r of the path taken by the alpha particle?

University Physics Volume 1
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Author:William Moebs, Samuel J. Ling, Jeff Sanny
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Chapter2: Vectors
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Problem 68P: Find the cross product for (a) and (b) and (c) and and (d) and
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Problem 7:   An alpha particle (consisting of two protons and two neutrons), traveling at a speed of v = 1.4 x 105 m/s, enters a region of constant magnetic fi eld of strength B = 1.8 T as shown in the fi gure. The direction of B is out of the image. The alpha follows a path that is a circular arc of radius r.

Part (a)  In atomic mass units, what is the mass m of an alpha particle? 

Part (b)  In units of elementary charge e, what is the electric charge q of an alpha particle? 
Part (c)  In meters, what is the radius of curvature r of the path taken by the alpha particle? 

B
Transcribed Image Text:B
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