Lecture13

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Session 2 - C. Palmer ˆ B = − B0 z August 21, 2013 38 Mass Spectrometer Part 1: Velocity Selector Mass What directions are the electric and magnetic forces? A)  FB in +x; FE in +x B)  FB in +x; FE in –x FB C)  FB in –x; FE in +x D)  FB in –x; FE in –x y z x Physics 2B - Summer Session 2 - C. Palmer FE ˆ B = − B0 z August 21, 2013 39 Mass Spectrometer Part 1: Velocity Selector ∑ Fi = ma Newton’s 2nd Law Balance means acceleration is 0 ∑ Fi = FE + FB = 0 ˆ ˆ = qE0 x + qvB0 ( − x ) = 0 FB y z x Physics 2B - Summer Session 2 - C. Palmer FE ˆ B = − B0 z August 21, 2013 40 y Mass Spectrometer Part 1: Velocity Selector ∑ Fi = ma z x Newton’s 2nd Law Balance means acceleration is 0 ˆ ˆ qE0 x + qvB0 ( − x ) = 0 Only particles with THIS velocity will make it through E0 v= B0 Physics 2B - Summer Session 2 - C. Palmer FB FE ˆ B = − B0 z August 21, 2013 41 Mass Spectrometer Part 2: Determining Particle charge to mass. The grey slit is a hard wall. What will the motion of the particle be when the particle enters the slit? A)  The particle will enter into y endless circular motion. B)  The particle will make a semi-circle to the LEFT before crashing into the wall. C)  The particle will make a semi-circle to the RIGHT before crashing into the wall. Physics 2B - Summer Session 2 - C. Palmer + z August 21, 2013 x ˆ B = − B1z 42 Mass Spectrometer Part 2: Determining Particle charge to mass. The grey slit is a hard wall. What will the motion of the particle be when the particle enters the slit? A)  The particle will enter into y endless circular motion. B)  The particle will make a semi-circle to the LEFT before crashing into the wall. C)  The particle will make a semi-circle to the RIGHT before crashing into the wall. Physics 2B - Summer Session 2 - C. Palmer + z August 21, 2013 x ˆ B = − B1z 43 Mass Spectrometer Part 2: Determining Particle y charge to mass. When you exam the crash site you find r. v qvB1 = m r m rB1 ⇒= q v Physics 2B - Summer Session 2 - C. Palmer ˆ B = − B1z + 2 z x August 21, 2013 44 Mass Spectrometer Part 2: Determining Particle y charge to mass. When you exam the crash site you find r. Recall the velocity selector allowed only one velocity through. ˆ B = − B1z + m rB1 rB1B0 = = q v E0 Physics 2B - Summer Session 2 - C. Palmer z x August 21, 2013 45...
View Full Document

This note was uploaded on 09/10/2013 for the course PHYS 2B 2b taught by Professor Hirsch during the Summer '10 term at UCSD.

Ask a homework question - tutors are online