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複選題17. A setup of photoelectric effect is illustrated in the right figure. (A)The kinetic energy \( K_{max} \) is proportional to the stopping potential (B)for a light of given frequency, \( K_{max} \) does not depend on the intensity of the light source (C)increasing the intensity of the light source should cause larger \( K_{max} \) (D)the slope of a "stopping potential vs. incident light frequency" plot depends on the metals (E)the work function of the target metal can be derived (T is the target, C is the cathode in the diagram)

複選題16. An unpolarized light is sent into three polarizing sheets (angles: \( \theta_1 \), \( \theta_2 \), \( \theta_3 \) from positive y-axis). Angles \( \theta_1 \) and \( \theta_3 \) are fixed, but angle \( \theta_2 \) is varied. The transmission intensity of the light as a function of \( \theta_2 \) is shown in the right figure. (A)Both \( \theta_1 \) or \( \theta_3 \) are located at 90° (B)transmission rate of the unpolarized light after sheet 1 is 1/2 (C)two sheets 1 and 3 are perpendicular to each other (D)transmission intensity is 0 if one takes out the sheet 2 (E)transmission rate is 1/8 if \( \theta_2 = 30° \)

複選題15. Which of the following are correct? (A)There can be no electric field inside a solid conducting sphere (B)the Gauss's Theorem of magnetism suggests that no magnetic monopole exists (C)electric current flowing in a wire will produce a magnetic field (D)a static magnetic field threaded through a loop will cause an emf (E)alternately changing electric and magnetic fields will generate an electromagnetic wave

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