Understanding Light and Its Properties

Describe the dispersion of light as illustrated by the refraction of white light by a glass prism.

• Dispersion of light occurs when white light is refracted by a glass prism, separating it into a spectrum of colors.

• White light is absorbed by the glass prism, resulting in darkness.

• A glass prism only reflects light without any dispersion.

• Refraction of light does not change the color of white light.

Answer explanation

The correct choice explains that dispersion occurs when white light is refracted by a glass prism, resulting in the separation of light into a spectrum of colors, demonstrating how different wavelengths bend at different angles.

What are the traditional seven colours of the visible spectrum in order of frequency?

• red, orange, yellow, green, blue, teal, violet

• red, yellow, green, blue, purple, pink, orange

• red, green, blue, yellow, cyan, magenta, white

• red, orange, yellow, green, blue, indigo, violet

Answer explanation

The traditional seven colors of the visible spectrum, in order of frequency, are red, orange, yellow, green, blue, indigo, and violet. This sequence is commonly remembered by the acronym ROYGBIV.

What are the traditional seven colours of the visible spectrum in order of wavelength?

• Red, Orange, Yellow, Green, Blue, Indigo, Violet

• Red, Yellow, Green, Blue, Purple, Pink, White

• Red, Orange, Yellow, Green, Blue, Cyan, Magenta

• Red, Orange, Yellow, Green, Blue, Indigo, Black

Answer explanation

The traditional seven colors of the visible spectrum, in order of wavelength, are Red, Orange, Yellow, Green, Blue, Indigo, and Violet. This sequence is commonly remembered by the acronym ROYGBIV.

What is meant by monochromatic light?

• Light that contains multiple wavelengths

• Light that is invisible to the human eye

• Light that changes color over time

• Light of a single wavelength or color.

Answer explanation

Monochromatic light refers to light that consists of a single wavelength or color. This distinguishes it from light containing multiple wavelengths, which would not be monochromatic.

List the main regions of the electromagnetic spectrum in order of frequency.

• Radio Waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-rays, Gamma Rays

• Visible Light, Ultraviolet, Radio Waves, Gamma Rays

• Microwaves, Radio Waves, X-rays, Infrared

• Sound Waves, Light Waves, Thermal Radiation

Answer explanation

The correct order of the main regions of the electromagnetic spectrum by frequency is: Radio Waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-rays, Gamma Rays. This sequence reflects increasing frequency and decreasing wavelength.

List the main regions of the electromagnetic spectrum in order of wavelength.

• Microwaves, Visible light, Radio waves, X-rays

• Infrared, Ultraviolet, X-rays, Gamma rays

• Visible light, Gamma rays, Radio waves, Infrared

• Gamma rays, X-rays, Ultraviolet, Visible light, Infrared, Microwaves, Radio waves

Answer explanation

The correct order of the electromagnetic spectrum by wavelength is: Gamma rays (shortest), X-rays, Ultraviolet, Visible light, Infrared, Microwaves, and Radio waves (longest). Thus, the correct answer is the last option.

What is the speed of electromagnetic waves in a vacuum?

• 299,792 km/s

• 300,000 km/s

• 250,000 km/s

• 150,000 km/s

Answer explanation

The speed of electromagnetic waves in a vacuum is approximately 299,792 km/s. This value is widely accepted in physics and is often rounded to 300,000 km/s for simplicity.

What are some typical uses of radio waves?

• Typical uses of radio waves include radio broadcasting, television broadcasting, mobile communications, satellite communications, and radar.

• Generating electricity from wind turbines

• Cooking food in a microwave oven

• Transmitting light signals in fiber optics

Answer explanation

Radio waves are used for various communications, including radio and television broadcasting, mobile and satellite communications, and radar. The other options listed do not involve radio waves.

How are microwaves used in satellite television?

• Microwaves are used to cook food in satellite dishes.

• Microwaves transmit signals from satellites to ground receivers in satellite television.

• Microwaves are used to power satellite dishes directly.

• Microwaves receive signals from ground receivers to satellites.

Answer explanation

Microwaves are essential in satellite television as they transmit signals from satellites to ground receivers, enabling the delivery of television content. This makes the correct choice the one that highlights this transmission role.

What is one application of infrared technology?

• Microwave ovens

• Laser printers

• Ultrasonic cleaners

• Thermal imaging cameras

Answer explanation

Thermal imaging cameras utilize infrared technology to detect heat emitted by objects, allowing for temperature measurement and visualization. This application is distinct from the other options listed.