Exam 11 please help me out. PHYSICS-Examination 11 - Continued During an experim

Question

Exam 11 please help me out.

PHYSICS-Examination 11 - Continued During an experiment, a scientist discovers that a dim source of red light will not cause a metal surface to discharge electrons. From your knowledge of the photoelectric effect, which of the following light sources might cause the metal rface to discharge electrons? (Choose as many as apply.) (A) a dim source of any electromagnetic radiation with a frequency lower than that of red light (B) a bright source of red light (C) a dim source of blue light (D) a bright source of blue light the following would you expect to have the largest wavelength associated Which of with it? (A) a quick-moving bee (B) an electron orbiting a nucleus (C) a slowly

Explanation / Answer

First question, the correct answers are options C and D.

Red light has a lower frequency and so lower energy. Therefore, it is not sufficient to eject electrons. Blue light, on the other hand, has a higher frequency than red light and hence possesses higher energy. Therefore, using blue light could be useful to discharge electrons. Energy does not depend on intensity, it depends only on frequency.

22. The correct option is C. This depends on mass.

23. The correct option is C, the efficiency of reactors.

24. Not sure about this.

25. The option A is correct. The magnitude of temperature required is simply difficult to achieve.

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