EM Spectrum

What portion of the electromagnetic spectrum can be detected by the human eye?

• Infrared light

• Ultraviolet light

• Visible light

• Radio waves

What type of EM radiation is used in remote controls?

• Ultraviolet radiation

• Infrared radiation

• Microwave radiation

• Radio waves

What is ultraviolet light?

• A type of EM radiation with a wavelength shorter than visible light but longer than X-rays, often associated with sunburn.

• A type of visible light that is responsible for colors in the rainbow.

• A type of radiation that is longer in wavelength than infrared light.

• A type of radiation used in microwave ovens.

How does the color of an object relate to light absorption and reflection?

• The color of an object is determined by the wavelengths of light it reflects; all other colors are absorbed.

• The color of an object is determined by the wavelengths of light it emits; all other colors are reflected.

• The color of an object is determined by the intensity of light it absorbs; all other colors are ignored.

• The color of an object is determined by the temperature of the object; all other colors are irrelevant.

If an object appears blue, what does this indicate about the colors of light?

• All colors are absorbed except blue; blue is reflected.

• All colors are reflected except blue; blue is absorbed.

• Only blue light is absorbed; all other colors are reflected.

• Blue and green colors are absorbed; red is reflected.

What is the electromagnetic spectrum?

• The range of all types of EM radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

• A type of radiation that only includes visible light and ultraviolet rays.

• A measurement of the speed of light in a vacuum.

• The spectrum of sound waves that can be heard by humans.

What is wavelength in the context of EM waves?

• The frequency of the wave measured in Hertz.

• The distance between two consecutive peaks of a wave, usually measured in meters.

• The amplitude of the wave measured in volts.

• The speed of the wave measured in kilometers per hour.

What happens to light when it hits a white object?

• All colors of the visible light spectrum are reflected.

• All colors of the visible light spectrum are absorbed.

• Only red light is reflected.

• Only blue light is reflected.

What is the visible light spectrum?

• The range of light wavelengths that can be seen by the human eye, approximately 400 to 700 nanometers.

• The range of sound frequencies that can be heard by humans, approximately 20 Hz to 20 kHz.

• The spectrum of electromagnetic radiation that includes radio waves and microwaves.

• The range of colors visible in a rainbow, from red to violet.

What is the frequency of a wave?

• The speed of the wave in meters per second (m/s).

• The distance between two consecutive waves, measured in meters (m).

• The number of waves that pass a point in one second, measured in Hertz (Hz).

• The amplitude of the wave, which is the height of the wave from its rest position.