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2010-11-Sem1-Test2

# 2010-11-Sem1-Test2 - NATIONAL UNIVERSITY OF SINGAPORE...

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NATIONAL UNIVERSITY OF SINGAPORE PC1222 FUNDAMENTALS OF PHYSICS II TEST 2 (Semester I: AY 2010-11, 8 November) Time Allowed: 1.5 Hours INSTRUCTIONS TO CANDIDATES 1. This test paper contains TWENTY multiple-choice questions and comprises EIGHT printed pages including the cover page. 2. Answer ALL questions on the Optical Reader Form. 3. For each question, select the correct answer A, B, C, or D by darkening the appropriate circle on the Optical Reader Form. Darken only ONE circle for each answer; darkening more than one circle will invalidate your answer. 4. All questions carry equal marks. 5. ONLY Optical Reader Form should be submitted at the end of the test. 6. This is a CLOSED book test. You are allowed however to bring in ONE help sheet no larger than A4 in size. 7. A list of physical constants is provided on page 2.

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Page 2 of 8 List of Physical Constants Permittivity of the vacuum: ε 0 = 8 . 85 × 10 - 12 C 2 / ( N · m 2 ) Coulomb’s constant: k = 8 . 99 × 10 9 N · m 2 / C 2 Mass of electron: m = 9 . 1094 × 10 - 31 kg Magnitude of charge of electron: e = 1 . 6022 × 10 - 19 C Electron volt: 1eV = 1 . 6022 × 10 - 19 J Permeability of the vacuum: μ 0 = 4 π × 10 - 7 T · m / A Speed of light: c = 2 . 9979 × 10 8 m / s Planck’s constant: h = 6 . 63 × 10 - 34 J · s Mass of proton: m p = 1 . 6726 × 10 - 27 kg Mass of neutron: m n = 1 . 6749 × 10 - 27 kg Rydberg’s constant: R = 1 . 097 × 10 7 m - 1 Bohr’s radius: a 0 = 0 . 0529nm Atomic mass unit 1u = 1 . 6605 × 10 - 27 kg PC1222 Fundamentals of Physics II Semester I, 2010/11
Page 3 of 8 1. Topic: Electromagnetic Wave Difficulty: Level 1 Light from an astronomical source is found to be shifted to a one percent lower frequency than had the source been at rest. What radial velocity could cause such a shift? (A) 1 . 5 × 10 6 m / s moving toward the observer (B) 1 . 5 × 10 6 m / s moving away from the observer (C) 3 . 0 × 10 6 m / s moving toward the observer (D) 3 . 0 × 10 6 m / s moving away from the observer 2. Topic: Electromagnetic Wave Difficulty: Level 1 The amplitude of the electric field component of an electromagnetic wave is increased from E to 3 E . What is the corresponding change in the intensity of the wave?

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