If green light incident on a solar cell successfully produces photoelectrons, wh

Question

If green light incident on a solar cell successfully produces photoelectrons, which of the following electromagnetic waves would also produce photoelectrons? a. Yellow, orange, red. and infrared. b. Infrared and radio waves. c. Blue, violet, and ultra violet. A bird sitting on a bare high voltage wire is not electrocuted because a. of the high resistance of its body. b. there is no electrical potential difference across its body. c. its body is at a low electrical potential compared to the wire. d. the high voltage across its feet produced a small current. Which of the following are advantages of a transformer? a. Provide for use of motors and generators. b. Provide a means of stepping voltage up or down. c. Open to prevent fires in the circuit. d. Provide a means to step up or down the voltage A device which transforms mechanical energy into electrical energy is a ____. a. magnet b. transformer c. generator d. motor Initially, the light incident on a Photovoltaic (PV) cell does not produce current. How can you change the light to produce a current in the PV cell? a. Increase the intensity of the light incident on the cell. b. Increase the wavelength of light incident on the cell. c. Increase the frequency of light incident on the cell. d. Place a light filter over the cell. The efficiency of a hydroelectric plant is the ratio (numerator to denominator) of the ____. a. heat plus electricity produced to the water volume. b. water outflow to the electrical energy input. c. electricity output to the potential energy input. d. electricity output to the water outflow. Two purposes of water in a reactor core are: a. Neutron absorber and heat transfer liquid. b. Neutron absorber and lubricant. c. Neutron moderator and lubricant. d. Neutron moderator and heat transfer liquid.

Explanation / Answer

1. if green is having energy threshold, then any wavelength lower than that should produce because it will have higher energy

Ans: C (B,V, UV)

2. Because they are not good conductors of electricity or they have high resistivity

Ans: A

3. A transformer is one which transfers energy between two or more circuits through electromagnetic induction. (B & D)

4. A generator (C)

5. Increase the frequency (C)

6. (C)

7. Purposes of water in reactor core

(A) neutron absorber and heat transfer liquid

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