June 2004, Part 3
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41 Which combination of quarks could produce a neutral baryon?

(1) cdt
(2) cts
(3) cdb
(4) cdu

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Base your answers to questions 42 through 44 on the information and diagram below.

A 20.-ohm resistor and a 30.-ohm resistor are connected in parallel to a 12-volt battery as shown. An ammeter is connected as shown.

42. What is the equivalent resistance of the circuit?

(1) 10. Ω
(2) 12 Ω
(3) 25 Ω
(4) 50. Ω

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43. What is the current reading of the ammeter?

(1) 1.0 A
(2) 0.60 A
(3) 0.40 A
(4) 0.20 A

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44. What is the power of the 30.-ohm resistor?

(1) 4.8 W
(2) 12 W
(3) 30. W
(4) 75 W

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45. Which graph best represents the relationship between the magnitude of the electric field strength, E, around a point charge and the distance, r, from the point charge?

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46. Several pieces of copper wire, all having the same length but different diameters, are kept at room temperature. Which graph best represents the resistance, R, of the wires as a function of their cross-sectional areas, A?

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54. According to the graph, as the potential difference increased, the resistance of the lightbulb

(1) decreased
(2) increased
(3) changed, but there is not enough information to know which way

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Base your answers to question 56 on the information below.

A student plucks a guitar string and the vibrations produce a sound wave with a frequency of 650 hertz.

56. The sound wave produced can best be described as a

(1) transverse wave of constant amplitude
(2) longitudinal wave of constant frequency
(3) mechanical wave of varying frequency
(4) electromagnetic wave of varying wavelengths

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Base your answers to question 69 on the information and graph below.

Sunlight is composed of various intensities of all frequencies of visible light. The graph represents the relationship between light intensity and frequency.

69 Based on the graph, which color of visible light has the lowest intensity?

(1) red
(2) green
(3) violet
(4) cannot be determined

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