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Physics 2B Final Exam Questions and Answers, Exams of Physics

The questions and answers for the final exam of physics 2b. The topics covered include sound, vibrations, electromagnetism, and optics. Students are required to calculate various physical quantities and identify the correct answer from multiple choices.

Typology: Exams

Pre 2010

Uploaded on 07/30/2009

koofers-user-fsy
koofers-user-fsy 🇺🇸

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Physics 2B Final 11/28/20
PHYSICS 2B EXAM (answer all questions on scantron 882-ES)
You must turn in this exam with your Scantron sheet. DUE 12/15/00 at NOON.
Assume the speed of sound in air is 340 m/s.
1. Bats use echolocation to navigate through their surroundings. The Vespertiliondae family of
bats emit short chirps as they fly. The chirps last about 0.003 seconds with a time interval of
0.070 seconds between chirps. Calculate the farthest object that can be detected by these
bats.
A. 12 m
B. 24 m
C. 36 m
D. 48 m
E. 96 m
2. Two loudspeakers radiate in phase at 170 Hz. A physics student sits 8 m from one speaker
and 12 m from the other. The intensity level from either speaker alone is 60dB. The student
measures the intensity level when both speakers are on. What will the sound meter read?
A. 0 dB
B. 60 dB
C. 63 dB
D. 66 dB
E. 69 dB
3. A stretched string of length L is observed to vibrate in five antinodes when driven by a
6.60x102 Hz mechanical vibrator. At what frequency are 3 antinodes observed?
A. 11.0x102 Hz
B. 825 Hz
C. 528 Hz
D. 396 Hz
E. 176 Hz
4. Three long parallel wires are at the corners of an equilateral triangle. The current in each wire
is 7.5A. Each side of the triangle is 0.10 m long. Assuming the upper wire is 1.0m long,
calculate the magnitude of the force on the upper wire due to the lower wires. Note: the
cross means that the current is into the page and a dot means that the current is out of
the page.
A. 1.1x10-4 N
B. 1.9x10-4 N
C. 2.2x10-4 N
D. 3.5x10-4 N
E. 6.0x10-4 N
5. Calculate the magnetic field at the upper vertex (refer to the figure of problem 6) due to the
lower wires.
A. 4.8x10-6 T
B. 1.5x10-5 T
C. 2.6x10-5 T
D. 3.0x10-5 T
E. 3.4x10-5 T
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PHYSICS 2B EXAM (answer all questions on scantron 882-ES)

You must turn in this exam with your Scantron sheet. DUE 12/15/00 at NOON. Assume the speed of sound in air is 340 m/s.

1. Bats use echolocation to navigate through their surroundings. The Vespertiliondae family of bats emit short chirps as they fly. The chirps last about 0.003 seconds with a time interval of 0.070 seconds between chirps. Calculate the farthest object that can be detected by these bats. A. 12 m B. 24 m C. 36 m D. 48 m E. 96 m 2. Two loudspeakers radiate in phase at 170 Hz. A physics student sits 8 m from one speaker and 12 m from the other. The intensity level from either speaker alone is 60dB. The student measures the intensity level when both speakers are on. What will the sound meter read? A. 0 dB B. 60 dB C. 63 dB D. 66 dB E. 69 dB 3. A stretched string of length L is observed to vibrate in five antinodes when driven by a 6.60x10^2 Hz mechanical vibrator. At what frequency are 3 antinodes observed? A. 11.0x10^2 Hz B. 825 Hz C. 528 Hz D. 396 Hz E. 176 Hz 4. Three long parallel wires are at the corners of an equilateral triangle. The current in each wire is 7.5A. Each side of the triangle is 0.10 m long. Assuming the upper wire is 1.0m long, calculate the magnitude of the force on the upper wire due to the lower wires. Note: the cross means that the current is into the page and a dot means that the current is out of the page. A. 1.1x10-4^ N B. 1.9x10-4^ N C. 2.2x10-4^ N D. 3.5x10-4^ N E. 6.0x10-4^ N 5. Calculate the magnetic field at the upper vertex (refer to the figure of problem 6) due to the lower wires. A. 4.8x10-6^ T B. 1.5x10-5^ T C. 2.6x10-5^ T D. 3.0x10-5^ T E. 3.4x10-5^ T

  1. For the arrangement of charges below, calculate the work required to assemble it. The length of each side of the square is 0.25 m. A. 0 J B. -0.20J C. -0.29J D. -0.86J E. -1.06J
  2. A circular material of radius R=0.20 m is cut into a quarter circle and placed in a vacuum. The index of refraction of this material is equal to 2.0. A light ray parallel to the base of this material is incident on this material at a distance L= 0.10 m above the base and emerges out of the material at the angle . Determine the value of the angle . A. 32  B. 30  C. 16  D. 14  E. The ray is actually reflected internally.
  3. A novice astronomer is using a telescope to measure the diameter of the moon. The focal length of the objective and eyepiece are 4.0m and 6.0 cm, respectively. He discovers that the telescope must be rotated through an angle of 0.63 radians (36 degrees) to view the moon from one side to the other. The earth-moon distance was also measured and found to be 3.6x10^8 m. The student then calculates the moon diameter to be A. 3.2x10^4 m B. 3.4x10^6 m C. 3.8x10^6 m D. 3.5x10^8 m E. 1.5x10^10 m n=2.

L 

R

-2.0C

2.0C

-2.0C

2.0C

  1. Consider the circuit shown below. The resistance values are R 1 =96, R 2 =48 R 3 =36 R 4 =24Calculate the power dissipated by R 4 if the power supply voltage V=64Volts? A. 0.58 W B. 0.74 W C. 0.96 W D. 2.8 W E. 5.6 W A, D, D, B, C, B, A, B, E, B, E, E, C, C

R 1

R 2

R 3

R 3

R 1

R 2

R 4

V