Physical Science Chapter 7

What is the speed of light?

3.00x10^8

A person suffering from nearsightedness can see distant objects clearly, but cannot focus on nearby objects. True False

False

In a transverse wave, the particles of the medium move parallel to the wave direction. True False

False

Electromagnetic waves differ from mechanical waves in their ability to travel through a vacuum as well as matter. True False

True

The speed of light in a medium such as air or glass is slightly different for different frequencies. True False

True

The sun appears a brilliant red at sunset because the atmosphere molecules and dust particles scatter the blue light more than the red. True False

True

Describe the image the lens of the eye forms on the retina. a.) The image is real, inverted, and smaller than the object b.) The image is real, upright, and smaller than the object c.) The image is virtual, upright, and larger than the object d.) The image is virtual, inverted, and larger than the object

a

Light of what color is scattered most in the atmosphere? Least? a.) Blue; red b.) Yellow; green c.) Blue; yellow d.) Red; yellow

a

Radio waves and x-rays are examples of: a.) electromagnetic waves b.) mechanical waves c.) pressure waves d.) longitudinal waves

a

Visible light of _____ color has the lowest frequency, while _____ light is has the highest frequency. a.) red; violet b.) violet; red c.) green; orange d.) blue;yellow

a

Which one of the following waves cannot travel through a vacuum? a.) sound waves b.) radio waves c.) light waves d.) x-rays

a

A luminous object is an object that: a.) you can see only at night b.) produces light c.) shines by reflected light d.) All of the above

b

A narrow beam of white light is passed through a prism and is separated into beams of light of various colors. This is an example of: a.) interference b.) dispersion c.) total internal reflection d.) resonance

b

Light is said to be a transverse wave. What is it that varies at right angles to the direction of the motion? a.) The frequency varies at right angles to the direction of the motion b.) The electric and magnetic fields travels at right angles to the direction of the motion c.) The amplitude travels at right angles to the direction of the motion d.) The wavelength travels at right angles to the direction of the motion

b

Whic of these is not a similarity shared by sound and light waves? a.) Sound waves and light waves both have measureable frequencies and wavelengths b.) Sound waves and light waves both need a medium to propagate c.) Sound waves and light waves can both be refracted and reflected d.) Sound waves and light waves both carry energy

b

Which of these can occur in transverse waves: reflection, interference, diffraction, and polarization? a.) interference, diffraction, and polarization b.) reflection, interference, diffraction, and polarization c.) reflection, interference, and diffraction d.) diffraction and polarization

b

If the earth had no atmosphere, what would the color of the sky be during the day? a.) blue b.) white c.) black d.) red e.) none of the above

c

What color would red cloth appear if it were illuminated alternately by white light, then by red light, and finally be green light? a.) first red, then black, and finally green b.) first red, then black, and finally red c.) first red, then red, and finally black d.) first white, then red, and finally green

c

What happens to light that is abosrbed by matter? a.) It is partly absorbed and partly transmitted b.) It ceases to exist c.) It is completely absorbed and gives up all its energy d.) Part becomes internal kinetic energy and part is lost

c

What model of light does the photoelectric effect support? The photoelectric effect is explained: a.) only by refraction and reflection b.) only by a wave model c.) by a particle model d.) by the light ray model e.) None of the above

c

Which color of light carries more energy? a.) red b.) orange c.) blue d.) green

c

Which of these differences between sound and light waves is not properly stated? a.) Light waves can pass through matter or a vacuum, whereas sound requires a medium to propagate and therefore cannot travel through a vacuum b.) Sound waves travel faster in a solid than a gas, whereas light travels slower c.) Light exhibits both diffraction and interference, whereas sound exhibits neither d.) Sound waves are longitudinal, whereas light waves are transverse

c

What model of light does the polarization of light support? Polarized light is explained: a.) only by refraction and reflection b.) by the light ray model c.) by electrons absorbing energy d.) only by a wave model

d

When white light is dispersed by a prism, red light is bent the least and violet light is bent the most. What does this tell you about the relative speeds of red and violet light in glass? a.) Violet light travels faster in glass than red light b.) Nothing, since the speed of light is a constant c.) Violet light travels at the same speed as red light in glass d.) Violet light travels slower in glass than red light

d