EM Test

Which portion of the electromagnetic spectrum is used in a television?

• infrared waves

• X rays

• radio waves

• gamma waves

Which portion of the electromagnetic spectrum is used to identify fluorescent minerals?

• ultraviolet light

• X rays

• infrared waves

• gamma rays

What is the wavelength of microwaves of 3.0 x 10^9 Hz frequency?

• 0.050 m

• 0.060 m

• 0.10 m

• 0.20 m

When red light is compared with violet light,

• both have the same frequency.

• both have the same wavelength.

• both travel at the same speed.

• red light travels faster than violet light.

If you are reading a book and you move twice as far away from the light source, how does the brightness at the new distance compare with that at the old distance? It is

• one-eighth as bright.

• one-fourth as bright.

• one-half as bright.

• twice as bright.

Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal-point distance from the mirror?

• virtual, upright, and magnification greater than one

• real, inverted, and magnification less than one

• virtual, upright, and magnification less than one

• real, inverted, and magnification greater than one

When red light and green light shine on the same place on a piece of white paper, the spot appears to be

• yellow.

• brown.

• white.

• black.

Which of the following is not an additive primary color?

• yellow

• blue

• red

• green

If you looked at a light through the lenses from two polarizing sunglasses that were overlapped at right angles to each other,

• all of the light would pass through.

• most of the light would pass through.

• little of the light would pass through.

• none of the light would pass through.

Part of a pencil that is placed in a glass of water appears bent in relation to the part of the pencil that extends out of the water. What is this phenomenon called?

• interference

• refraction

• diffraction

• reflection