PhysicsLAB: 1999 Physics Olympiad Screening Test (Part 2)

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AAPT Quiz
1999 Physics Olympiad Screening Test (Part 2)

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21. Which of the following wave properties cannot be demonstrated by all kinds of waves?

PolarizationDiffractionSuperpositionRefractionFrequency

22. A source when at rest in a medium produces waves with a velocity v and a wavelength of

. If the source is set in motion to the left with a velocity v_s what would be the length of the wavelengths produced directly in front of the source?

23. A beam of light strikes one mirror of a pair of right angle mirrors at an angle of incidence of 45^o as shown in the diagram.

If the right angle mirror assembly is rotated such that the angle of incidence is now 60^o, what will happen to the angle of the beam that emerges from the right angle mirror assembly?

It will move through an angle of 15^o with respect to the original emerging beam.
It will move through an angle of 30^o with respect to the original emerging beam.
It will move through an angle of 45^o with respect to the original emerging beam.
It will move through an angle of 60^o with respect to the original emerging beam.
It will emerge parallel to the original emerging beam.

24. What would be the total current being supplied by the battery in the circuit shown?

3.0 amperes2.25 amperes2.0 amperes1.5 amperes1.0 amperes

25. Consider a simple circuit containing a battery and three light bulbs. Bulb A is wired in parallel with bulb B and this combination is wired in series with bulb C. What would happen to the brightness of the other two bulbs if bulb A were to burn out?

only bulb B would get brighter.
both would get brighter.
bulb B would get brighter and bulb C would get dimmer.
bulb B would get dimmer and bulb C would get brighter.
There would be no change in the brightness of either bulb B or bulb C.

26. A coil of wire is moved vertically at a constant velocity through a horizontal magnetic field. Assume the plane of the coil is perpendicular to the magnetic field. Which of the following graphs would best represent the electric current induced in the coil if it started somewhat above the magnetic field and ended equally as far below the magnetic field?

ABCDE

27. Three metal spheres A, B, and C are mounted on insulating stands. The spheres are touching one another, as shown in the diagram.

A strong positively charged object is brought near sphere A and a strong negative charge is brought near sphere C. While the charged objects remain near spheres A and C, sphere B is removed by means of its insulating stand. After the charged objects are removed, sphere B is first touched to sphere A and then to sphere C. The resulting charge on B would be:

the same sign but ½ the magnitude as originally on sphere A.
the opposite sign but ½ the magnitude as originally on sphere A.
the opposite sign but ¼ the magnitude as originally on sphere A.
the same sign but ½ the magnitude as originally on sphere C.
neutrally charged.

28. Which of the following graphs would best represent the electric field of a hollow Van de Graff sphere as a function of distance from its center when it is charged to a potential of 400,000 volts?

ABCDE

29. A mass spectrograph separates ions by weight using simple concepts from physics. Charged ions are given a specific kinetic energy by accelerating them through a potential difference. The ions then move through a perpendicular magnetic field where they are deflected into circular paths with differing radii. How would the radius of a singularly ionized common helium atom ⁴ ₂He⁺¹ compare to the radius of a doubly ionized common oxygen atom ¹⁶ ₈O⁺² if they were accelerated through the same potential difference and were deflected by the same magnetic field?

The radius of the He ion path is 4 times the radius of the 0 ion path.
The radius of the 0 ion path is 2 times the radius of the He ion path.
The radius of the 0 ion path is 4 times the radius of the He ion path.
The radius of the 0 ion path is 8 times the radius of the 0 ion path
The radius of the He ion path is equal to the radius of the 0 ion path.

30. A bar magnet is thrust into a coil of wire as indicated in the diagram below.

Which of the following statements concerning this experiment is correct?

The polarity of the coil at H is North, at G is South, and the induced current is indicated by arrow X.
The polarity of the coil at H is South, at G is North, and the induced current is indicated by arrow Y.
The polarity of the coil at H is North, at G is South, and the induced current is indicated by arrow Y.
The polarity of the coil at H is South, at G is North, and the induced current is indicated by arrow X.
There is no polarity to the coil and no current in the coil.

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