Physics 152 Exam 2 Questions and complete Answers
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Which of the following statements are true about light waves? - Higher frequency light travels faster than lower frequency light. - The lower the frequency, the shorter the wavelength. - The higher... the frequency, the longer the wavelength. - The shorter the wavelength, the higher the frequency. - The lower the frequency, the longer the wavelength. Correct answers - The shorter the wavelength, the higher the frequency. - The lower the frequency, the longer the wavelength. Maxwell's Predictions Correct answers 1. Electric field lines originate on positive charges and terminate on negative charges 2. Magnetic field lines always form closed loops 3. A varying magnetic field induces an emf, and so an electric field 4. Magnetic fields are generated by moving charges or currents. Doppler effect Correct answers an observed change in the frequency of a wave when the source or observer is moving The primary coil in an ideal transformer has N turns. To output half the input potential difference, the secondary coil should have 1. N/2 turns 2. N turns 3. 2N turns Correct answers 1. N/2 turns number of turns is directly related to the voltage. We want to decrease the voltage so therefore decrease the number of turns Which of the listed forms of electromagnetic waves have the greatest frequency? 1. visible light 2. microwaves 3. radio waves 4. gamma rays Correct answers Gamma rays Which of the following statements are true regarding electromagnetic waves traveling through a vacuum? (Select all that apply. 1. All waves have the same wavelength 2. All waves have the same frequency. 3. All waves travel at 3.00 *10^8 m/s. 4. The electric and magnetic fields associated with the waves are perpendicular to each other and to the direction of wave propagation. 5. The speed of the waves depends on their frequency. Correct answers 3. All waves travel at 3.00 *10^8 m/s. 4. The electric and magnetic fields associated with the waves are perpendicular to each other and to the direction of wave propagation. index of refraction Correct answers a measure of the amount a ray of light bends when it passes from one medium to ano [Show More]
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