PhysicsLAB NY Regents Exams
June 2002, Part 2

Constants        Formulas

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21 An incandescent light bulb is supplied with a constant potential difference of 120 volts. As the filament of the bulb heats up, its resistance 

(1) increases and the current through it decreases
(2) increases and the current through it increases
(3) decreases and the current through it decreases
(4) decreases and the current through it increases

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22 During a thunderstorm, a lightning strike transfers 12 coulombs of charge in 2.0 10–3 second. What is the average current produced in this strike?

(1) 1.7 10–4 A
(2) 2.4 10–2 A
(3) 6.0 103 A
(4) 9.6 103 A

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Note that question 23 has only three choices. 

23 A 30.-ohm resistor and a 60.-ohm resistor are connected in an electric circuit as shown below. Compared to the electric current through the 30.-ohm resistor, the electric current through the 60.-ohm resistor is

(1) smaller
(2) larger
(3) the same

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24 An operating electric heater draws a current of 10. amperes and has a resistance of 12 ohms. How much energy does the heater use in 60. seconds?

(1) 120 J
(2) 1200 J
(3) 7200 J
(4) 72,000 J

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25 If the charge on each of two small charged metal spheres is doubled and the distance between the spheres remains fixed, the magnitude of the electric force between the spheres will be

(1) the same
(2) two times as great
(3) one-half as great
(4) four times as great

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26 The diagram below represents a periodic wave. Which two points on the wave are in phase?

(1) A and C
(2) B and D
(3) A and D
(4) B and E

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27 A beam of monochromatic light travels through flint glass, crown glass, Lucite, and water. The speed of the light beam is slowest in

(1) flint glass
(2) crown glass
(3) Lucite
(4) water

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28 A standing wave pattern is produced when a guitar string is plucked. Which characteristic of the standing wave immediately begins to decrease?

(1) speed
(2) wavelength
(3) frequency
(4) amplitude

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29 A source of sound waves approaches a stationary observer through a uniform medium. Compared to the frequency and wavelength of the emitted sound, the observer would detect waves with a

(1) higher frequency and shorter wavelength
(2) higher frequency and longer wavelength
(3) lower frequency and shorter wavelength
(4) lower frequency and longer wavelength

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30 What is the smallest electric charge that can be put on an object?

(1) 9.11 10–31 C
(2) 1.60 10–19 C
(3) 9.00 109 C
(4) 6.25 1018 C

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31 Which characteristic of electromagnetic radiation is directly proportional to the energy of a photon?

(1) wavelength
(2) period
(3) frequency
(4) path

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32 What is the maximum height to which a 1200-watt motor could lift an object weighing 200. newtons in 4.0 seconds? 

(1) 0.67 m
(2) 1.5 m
(3) 6.0 m
(4) 24 m

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33 A spring of negligible mass has a spring constant of 50. newtons per meter. If the spring is stretched 0.40 meter from its equilibrium position, how much potential energy is stored in the spring?

(1) 20. J
(2) 10. J
(3) 8.0 J
(4) 4.0 J

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34 How much current flows through a 12-ohm flashlight bulb operating at 3.0 volts?

(1) 0.25 A
(2) 0.75 A
(3) 3.0 A
(4) 4.0 A

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35 Which diagram below best represents the phenomenon of diffraction?

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36 The displacement-time graph below represents the motion of a cart initially moving forward along a straight line. During which interval is the cart moving forward at constant speed?

(1) AB
(2) BC
(3) CD
(4) DE

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37 The diagram below represents shallow water waves of wavelength λ passing through two small openings, A and B, in a barrier. How much longer is the length of path AP than the length of path BP?

(1) 1λ
(2) 2λ
(3) 3λ
(4) 4λ

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Note that question 38 has only three choices. 

38 In the diagram below, lamps L1 and L2 are connected to a constant voltage power supply. If lamp L1 burns out, the brightness of L2 will

(1) decrease
(2) increase
(3) remain the same

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39 What is the approximate mass of a pencil?

(1) 5.0 10–3 kg 
(2) 5.0 10–1 kg 
(3) 5.0 100 kg
(4) 5.0 101 kg

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40 What is the minimum energy needed to ionize a hydrogen atom in the n = 2 energy state?

(1) 13.6 eV
(2) 10.2 eV
(3) 3.40 eV
(4) 1.89 eV





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