Can you charge an object without actually touching it with another charged object?
A. Of course not, you can only charge an object by touching it with something else charged.
B. Yes, this is an example of charging by induction.
C. Yes, this is an example of charging by convection.
D. No, objects do not become charged.
B. Yes, this is an example of charging by induction.
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Photoelectric Effect: A beam of light with a frequency range from 3.01 × 1014 Hz to 6.10 × 1014 Hz is incident on a metal surface. If the work function of the metal surface is 2.20 eV, what is the maximum kinetic energy of photoelectrons ejected from this surface? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 0.33 eV B. 0.21 eV C. 0.42 eV D. 0.16 eV E. 0.48 eV
A solid conducting sphere (radius = 5.0 cm) has a charge of 0.25 nC distributed uniformly on its surface. If point A is located at the center of the sphere and point B is 15 cm from the center, what is the magnitude of the electric potential difference between these two points?
a. 23 V b. 30 V c. 15 V d. 45 V e. 60 V
perpendicular to the jet’s path from left to right, which part of the airplane becomes negatively charged?
A. Its nose B. Its tail C. Its top D. Its bottom E. Its left wing F. Its right wing T. (No part becomes charged.)
How does sonar work?
a. It measures the speed of sound by timing how long it takes sound to travel. b. It compares the speed of sound under different circumstances, by changing temperature or gas content. c. It compares the frequencies of the emitted and reflected sound wave. d. It measures the distance to underwater objects by bouncing sound waves off the objects. e. It measures the distance to objects in the upper atmosphere by timing the speed of sound to those objects.