The work of which scientist(s) helped to explain light\'s ability to propagate t

Question

The work of which scientist(s) helped to explain light's ability to propagate through a vacuum? A. Davisson and Germer B. Newton C. Fresnel, Fraunhofer, and Arago D. Maxwell

The rate at which light energy is radiated from a source is measured in which of the following units?

To increase the magnification of an image with a magnifying glass, you can

Which of the following is not a characteristic of electromagnetic waves?

The light intensity of a source is 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

  Which of the following objects uses two converging lenses to produce two images, the second of which is virtual, magnified, and inverted?

Which one of the following accurately describes a proper use of eyeglasses?

  Which of the following is not a natural source of light?

The rate at which light energy is radiated from a source is measured in which of the following units?

        A. Lux    B. Lumen    C. Candela    D. Angstrom

To increase the magnification of an image with a magnifying glass, you can

        A. shorten the focal length of the lens.    B. shorten the distance between the object and the lens as much as possible.    C. place the object on top of the lens.    D. elongate the focal length of the lens.

Which of the following is not a characteristic of electromagnetic waves?

        A. They can travel at various speeds through any one material.    B. They can be refracted.    C. They can be reflected.    D. They can travel through a vacuum.

The light intensity of a source is 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

        A. 5 meters    B. 7 meters    C. 4 meters    D. 6 meters

  Which of the following objects uses two converging lenses to produce two images, the second of which is virtual, magnified, and inverted?

        A. Corrective eyeglasses    B. Slide projector    C. Camera    D. Compound microscope

Which one of the following accurately describes a proper use of eyeglasses?

        A. Using diverging lenses to help a farsighted person by moving the image from behind the retina to the retina    B. Using converging lenses to help a nearsighted person by moving the image from in front of the retina to the retina    C. Using converging lenses to help a nearsighted person by moving the image from behind the retina to the retina    D. Using diverging lenses to help a nearsighted person by moving the image from in front of the retina to the retina

  Which of the following is not a natural source of light?

        A. The sun    B. Oil lamps    C. Phosphorescence    D. Fluorescence

Explanation / Answer

1) Ans D) - Maxwell

2)

Ans B) - Lumen.

3)

Ans B) -   shorten the distance between the object and the lens as much as possible.

4)

Ans D) - They can travel through a vacuum.

5)

D^2 = I / E

D^2 = 100 / 4 = 25

D = 5 m

Ans A) - 5 m

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