8. The drawing shows four situations A, B, C, and D in which an observer and a s

Question

8. The drawing shows four situations A, B, C, and D in which an observer and a source of electromagnetic waves are moving along the same line. In each case the source emits a wave of the same frequency, and in each case only the source or the observer is moving. The arrow in each situation denotes the velocity vector, which has the same magnitude in each situation. Rank the frequencies of the observed electromagnetic waves in descending order (largest first) according to magnitude. Observer Souree (a) A and B (a tie), C and D (a tie) (b) B, C and D (a tie), A (c) A and D (a tie), B and C (a tie) C (d) B and D (a tie), A and C (a tie) (e) A, B and C (a tie), D 9. Which one of the following statements concerning the energy carried by an electromagnetic wave is true? (a) The energy is carried equally by the electric and magnetic fields (b) The energy is carried only by the magnetic field (c) The energy is carried only by the electric field (d) More energy is carried by the electric field than by the magnetic field (e) More energy is carried by the magnetic field than by the electric field 10. Which one of the following statements concerning spherical mirrors is correct? (a) Only a convex mirror can produce an enlarged image. (b) Both concave and convex mirrors can produce an enlarged image. (c) Only a concave mirror can produce an enlarged image, provided the object distance is less than the radius of curvature. (d) Only a concave mirror can produce an enlarged image, provided the object distance is greater than the radius of curvature. 11. An object is placed at the focal point of a concave spherical mirror. Which of the following descriptions best describes the image produced in this situation? (a) upright, larger, real (b) inverted, same size, real (c) upright,larger, virtual (d) inverted, smaller, real (e) the image is formed at infinity 12. You hold the words RUN AROUND in front of a plane mirror. What does the image of these words look like? (o) AROUND RUN (b) (c) NOa aNNOH

Explanation / Answer

9.

a) the energy is carried equally by the electric and magnetic fields

10

correct choice is C)

11.

e)

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