Velocity Pressure A v 1 v 2 p 1 p 2 B v 1 v 2 p 1 p 2 C v 1 v 2 p 1 p 2 D v 1 v

# Velocity pressure a v 1 v 2 p 1 p 2 b v 1 v 2 p 1 p 2

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Velocity Pressure ( A ) v 1 < v 2 p 1 = p 2 ( B ) v 1 < v 2 p 1 > p 2 ( C ) v 1 = v 2 p 1 < p 2 ( D ) v 1 > v 2 p 1 = p 2 ( E ) v 1 > v 2 p 1 > p 2
50 © 2012 The College Board. Visit the College Board on the Web: . Sample Questions for Physics B 14. Two long parallel wires, separated by a distance d , carry equal currents I toward the top of the page, as shown above. The magnetic field due to the wires at a point halfway between them is ( A ) zero in magnitude ( B ) directed into the page ( C ) directed out of the page ( D ) directed to the right ( E ) directed to the left 15. A source S of sound and a listener L each can be at rest or can move directly toward or away from each other with speed v 0 . In which of the following situations will the observer hear the lowest frequency of sound from the source? ( A ) S v = 0 L v = 0 ( B ) S v = 0 L n v v 0 ( C ) S v v v 0 L v 0 ( D ) S v v v 0 L n v v 0 ( E ) S n v v 0 L v v v 0 16. The wavelength of yellow sodium light in vacuum is 5.89 3 10 –7 m. The speed of this light in glass with an index of refraction of 1.5 is most nearly ( A ) 4 3 10 –7 m/s ( B ) 9 3 10 –7 m/s ( C ) 2 3 10 8 m/s ( D ) 3 3 10 8 m/s ( E ) 4 3 10 8 m/s
51 © 2012 The College Board. Visit the College Board on the Web: . Sample Questions for Physics B 17. An object O is in front of a convex mirror. The focal point of the mirror is labeled F and the center of curvature is labeled C . The direction of the reflected ray is correctly illustrated in all of the following EXCEPT which diagram? 18. A system initially consists of an electron and an incident photon. The electron and the photon collide, and afterward the system consists of the electron and a scattered photon. The electron gains kinetic energy as a result of this collision. Compared with the incident photon, the scattered photon has ( A ) the same energy ( B ) a smaller speed ( C ) a larger speed ( D ) a smaller frequency ( E ) a larger frequency
52 © 2012 The College Board. Visit the College Board on the Web: . Sample Questions for Physics B 19. In an experiment, light of a particular wavelength is incident on a metal surface, and electrons are emitted from the surface as a result. To produce more electrons per unit time but with less kinetic energy per electron, the experimenter should do which of the following? ( A ) Increase the intensity and decrease the wavelength of the light. ( B ) Increase the intensity and the wavelength of the light. ( C ) Decrease the intensity and the wavelength of the light. ( D ) Decrease the intensity and increase the wavelength of the light. ( E ) None of the above would produce the desired result. 20. When 10 B is bombarded by neutrons, a neutron can be absorbed and an alpha particle ( 4 He) emitted. The kinetic energy of the reaction products is equal to the ( A ) kinetic energy of the incident neutron ( B ) total energy of the incident neutron ( C ) energy equivalent of the mass decrease in the reaction ( D ) energy equivalent of the mass decrease in the reaction, minus the kinetic energy of the incident neutron ( E ) energy equivalent of the mass decrease in the reaction, plus the kinetic energy of the incident neutron

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