Characteristics of Light

Which of the following is not a component of the electromagnetic spectrum?

• light waves

• radio waves

• microwaves

• sound waves

All of the following statements about electromagnetic waves are true except which one?

• Electromagnetic waves are distinguished by their different shapes.

• Electromagnetic waves are composed of oscillating electric and magnetic fields.

• Electromagnetic waves are transverse waves

• Electromagnetic waves move in a direction that is perpendicular to the electric and magnetic fields.

Given the wave speed equation c = fλ, what is the relationship between frequency (f) and wavelength (λ)?

• direct

• exponential

• inverse

• none of the above

Which variable in the wave speed equation is constant in a vacuum?

• c

• f

• λ

• all of the above

Which of the following is approximately equal to the currently accepted value for the speed of light?

• 3.00 x 10⁶ m/s

• 3.00 x 10⁸ m/s

• 30.0 x 10⁸ m/s

• 3.00 x 10⁹ m/s

The speed of light is incredibly fast. Physicists consider it to be

• finite.

• infinite.

• immeasurable.

• variable.

The intensity of light depends on the

• speed of the light wave and the amount of light energy emitted from a source.

• distance from the light source and the type of surface the light strikes.

• amount of light energy emitted from a source and the distance from the light source.

• size of the surface area which the light strikes and the distance from the light source.

If the distance from a light source is increased by a factor of 5, the illuminance

• also increases by a factor of 5.

• decreases by a factor of 25.

• increases by a factor of 25.

• decreases by a factor of 5.

What is the frequency of an infrared wave whose wavelength is 650 µm?

• 2.15 x 10¹⁴

• 4.6 x 10¹¹

• 2.15 x 10²

• 4.6 x 10²

The rate at which light is emitted from a source is called the _________ the and is measured in ___________.

• harmonius flux, lumens (lm)

• luminous flux, lumens (lm)

• luminous flux, watts (W)

• voluminous flux, lumens (lm)