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The work of which scientist(s) helped to explain light's ability to propagate through a vacuum?
A. Maxwell
==B. Davisson and Germer
C. Fresnel, Fraunhofer, and Arago
D. Newton
An object that has a height of 0.4 meter is placed at a distance of 0.7 meter from a concave spherical mirror. An image is formed in front of the mirror and has a height of 0.35 meter. How far from the mirror is the image located?
A. 0.8000 m
==B. 0.6125 m
C. 0.2000 m
D. 0.4275 m
If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're really trying to figure out the
== A. illuminance of a surface.
B. luminous intensity.
C. luminous flux.
D. incandescence.
In any one material, all electromagnetic waves have the same
==A. velocity.
B. frequency.
C. wavelength.
D. amplitude.
The illuminance on a surface is 6 lux and the surface is 4 meters from the light source. What is the intensity of the source?
A. 72 candelas
==B. 96 candelas
C. 24 candelas
D. 144 candelas
Which of the following devices is associated with the reception of radio signals?
A. Microphone
==B. Demodulator
C. Transmitting antenna
D. Oscillator
Suppose that an electric charge is produced on one part of a body. If the charge spreads through the entire body, the body is most likely made of
A. oil.
==B. metal.
C. plastic.
D. porcelain.
Which of the following accurately describes junction diodes?
A. Free electrons are concentrated in the P-type material and holes form in the N-type material.
B. In a forward-biased setup, large numbers of charge carriers will be pulled across the junction and result in a large current.
==C. The negative terminal of the source of voltage is connected to the N-type material within a reverse-biased setup.
D. Only a small current will flow through the diode in the forward-biased setup.
Imagine that an uncharged pith ball is brought into the electrostatic field of a charged rod. The side of the pith ball closest to the negatively charged end of the rod will
A. be given a negative charge produced by the movement of electrons from the rod.
B. not experience any induced charge and remain neutral.
==C. be given a positive charge produced by the movement of electrons to the other end of the ball.
D. be given a negative charge produced by the movement of electrons from the other end of the ball.
A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device?
A. 8 A
B. 10 A
==C. 3.33 A
D. 13.32 A
Are they correct?
A. Maxwell
==B. Davisson and Germer
C. Fresnel, Fraunhofer, and Arago
D. Newton
An object that has a height of 0.4 meter is placed at a distance of 0.7 meter from a concave spherical mirror. An image is formed in front of the mirror and has a height of 0.35 meter. How far from the mirror is the image located?
A. 0.8000 m
==B. 0.6125 m
C. 0.2000 m
D. 0.4275 m
If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're really trying to figure out the
== A. illuminance of a surface.
B. luminous intensity.
C. luminous flux.
D. incandescence.
In any one material, all electromagnetic waves have the same
==A. velocity.
B. frequency.
C. wavelength.
D. amplitude.
The illuminance on a surface is 6 lux and the surface is 4 meters from the light source. What is the intensity of the source?
A. 72 candelas
==B. 96 candelas
C. 24 candelas
D. 144 candelas
Which of the following devices is associated with the reception of radio signals?
A. Microphone
==B. Demodulator
C. Transmitting antenna
D. Oscillator
Suppose that an electric charge is produced on one part of a body. If the charge spreads through the entire body, the body is most likely made of
A. oil.
==B. metal.
C. plastic.
D. porcelain.
Which of the following accurately describes junction diodes?
A. Free electrons are concentrated in the P-type material and holes form in the N-type material.
B. In a forward-biased setup, large numbers of charge carriers will be pulled across the junction and result in a large current.
==C. The negative terminal of the source of voltage is connected to the N-type material within a reverse-biased setup.
D. Only a small current will flow through the diode in the forward-biased setup.
Imagine that an uncharged pith ball is brought into the electrostatic field of a charged rod. The side of the pith ball closest to the negatively charged end of the rod will
A. be given a negative charge produced by the movement of electrons from the rod.
B. not experience any induced charge and remain neutral.
==C. be given a positive charge produced by the movement of electrons to the other end of the ball.
D. be given a negative charge produced by the movement of electrons from the other end of the ball.
A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device?
A. 8 A
B. 10 A
==C. 3.33 A
D. 13.32 A
Are they correct?
Answers
Answered by
Anonymous
12. The work of which scientist(s) helped to explain light's ability to propagate through a vacuum?
A. Fresnel, Fraunhofer, and Arago
B. Davisson and Germer
C. Maxwell
D. Newton
A. Fresnel, Fraunhofer, and Arago
B. Davisson and Germer
C. Maxwell
D. Newton
Answered by
John
12. The work of which scientist(s) helped to explain light's ability to propagate through a vacuum?
A. Fresnel, Fraunhofer, and Arago
B. Davisson and Germer
C. Maxwell
D. Newton
A. Fresnel, Fraunhofer, and Arago
B. Davisson and Germer
C. Maxwell
D. Newton
Answered by
Hannah
Davisson and Germer
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