A beam of white light of a certain frequency is incident on a metal surface. If the work function of this surface is 2.20 eV,
what frequency of light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface?
A)
2.05 × 1014 Hz
B)
1.02 × 1014 Hz
C)
2.50 × 1014 Hz
D)
3.53 × 1014 Hz
E)
5.92 × 1014 Hz
E
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A parallel-plate capacitor has plates of area 0.80 m2 separated by a distance of 3.0 mm. What is this capacitor's capacitance?
A) 270 F B) 70 F C) 2.4 × 10-9 F D) 4.8 × 10-10 F E) 3.6 × 10-10 F
If you are driving 72 km/h along a straight road and you look to the side for 4.0 s, how far do you travel during this inattentive period?
A) 40 m B) 20 m C) 18 m D) 80 m
Might a region of intergalactic [between the galaxies] space, containing no material particles, contain energy?
A) No, because only material particles can possess energy. B) No, because physically nothing exists except particles and empty space. C) No, for both of the above reasons. D) Yes, it might contain the thermal energy of intergalactic gases. E) Yes, in the form of electromagnetic fields and other force fields.
Which of these is an electronic instrument that can plot voltage as it varies with time?
A. An electroscope B. An oscilloscope C. An ammeter D. A galvanometer