light

How do you call objects that emit light?

• luminous

• non-luminous

• opaque

• transparent

Which of the following items best describes the nature of light?

• current and wave

• mass and particle

• point and wave

• wave and particle

Tags

NGSS.HS-PS4-3

The following are natural sources of light in the surroundings, EXCEPT__________

• fire

• flashlight

• sun

• lightning

According to Louis de Broglie, why is light said to have a dual nature?

• It shows the properties of wave only.

• It exhibits the properties of reflection.

• It has both interference and polarization effect.

• It displays the properties of both wave and particle.

Tags

NGSS.HS-PS4-3

Who among the scientists below formulated the wave theory of light?

• Isaac Newton

• Louis de Broglie

• Christian Huygens

• James Clerk Maxwell

Tags

NGSS.HS-PS4-3

Which of the following is NOT a property of light?

• Direction

• Frequency

• Intensity

• Width

Which of the following materials would reflect light the most?

• black rock

• dark brown carpet

• flat sheet of aluminum foil

• piece of red construction paper

Tags

NGSS.MS-PS4-2

The distance of an observer from two identical kinds of light sources varies. Light

source A is 200 centimeters away while the light source B is 300 centimeters away

from the observer. Does light source A give higher light intensity than light source B?

• Yes, because it is away from the observer

• Yes, because it is much closer to the observer

• No, because the distances of light source vary

• No, because its distance is closer from the observer

The intensity of light is inversely proportional to the distance from the eye of the

observer. Which of the following statements explain the relationship between

intensity and distance?

I. As the distance increases, the intensity of light decreases because it spreads out

over a larger surface area.

II. When the distance increases, the intensity of light increases because the light

rays compressed in larger surface area.

III. If the distance increases, the intensity of light decreases because light waves

spread out more in its surrounding.

• I, II, and III

• I and II only

• I and III only

• II and III only

refer to the illustration below. Suppose two identical kinds of light

sources, A and B, shines on a surface of a board when placed 100 cm to the left and 50

cm to the right of the board, respectively.

Will the light intensity measured on the cardboard facing light source A is higher than the side facing light source B?

• No, because light source A is farther from the cardboard than light source B.

• Yes, because light source A is farther from the cardboard than light source B.

• Yes, because light source B is much closer to the cardboard than light source

  A.

• No, because the distance of light sources has no effect on their light intensities.