Home Page Textbooks Nelson Science Perspectives 10 Section 11-1: What is Light?

Nelson Science Perspectives 10

1st Edition

Christy C. Hayhoe, Doug Hayhoe, Jeff Major, Maurice DiGiuseppe

ISBN: 9780176355289

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Section 11-1: What is Light?

Exercise 1

Solution 1

Solution 2

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Conduction and convection both require a particle medium for heat transfer to take place, while radiation does not require any medium and by radiation, heat transfer can also take place through vacuum.

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Radiation is different from conduction and convection since it does not require medium for head transfer and they do; heat can be transferred through the vacuum as well.

Result

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Conduction and convection require medium for heat transfer, and radiation does not.

Exercise 2

Solution 1

Solution 2

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Maxwell predicted that:

1. Electromagnetic waves (as the name suggest) are a combination of both electricity and magnetism.

2. Electromagnetic waves do not require a particle medium to travel.

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-Maxwell’s first assumption is that a static magnetic field, in fact, its waves, and magnetic waves, works as a whole at high speed through the middle thus forming an electromagnetic wave.

-Maxwell’s second assumption is that the movement of electromagnetic waves is not conditioned by any medium through which it would move. That it can propagate in a vacuum and that the speed of movement of electromagnetic waves is proportional to the speed of light.

Result

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Maxwell’s assumptions about the properties of the electromagnetic waves

Exercise 3

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Solution 2

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The properties of electromagnetic waves were confirmed by Heinrich Hertz in 1887 with the discovery of radio waves followed by the discovery of X-rays in 1895 by William Konard Roengten.

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Two discoveries that have confirmed the existence of electromagnetic waves are discovery of radio waves by Hertz in 1887. and discovery of X-rays by Roentgen in 1895.

Result

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Discovery of radio waves and discovery of X-rays.

Exercise 4

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Solution 2

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From lowest energy to highest energy:

Microwaves, infrared light, red light, X-rays, gamma rays.

Result

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Microwaves, infrared light, red light, X-rays, gamma rays.

Result

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Lowest energy to highest energy: microwaves, infra-red light, red light, X-rays and gamma rays.

Exercise 5

Solution 1

Solution 2

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Sunscreen protects skin from ultraviolet light. which can cause sunburns, but some serious skin problems as well.

Result

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From ultraviolet light.

Result

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Sunscreen should protect against ultra-violet rays to help prevent sunburn.

Exercise 6

Solution 1

Solution 2

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Seven colours that Newton has identified in the visible spectrum of white light are:

red, orange, yellow, green, blue, indigo and violet.

Result

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Red, orange, yellow, green, blue, indigo and violet.

Result

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Newton identified red, orange, yellow, green, blue, indigo and violet in the visible spectrum of white light.

Exercise 7

Solution 1

Solution 2

Result

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Using electromagnetic waves to examine the universe other than visible light is essential because this gives a more detailed analysis of the universe and its expansion capabilities.

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It is more useful since many different forms of radiation, apart from visible light, are emitted and by detecting these forms we can get pretty detailed analysis about objects and phenomena in universe.

Result

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Because many different forms of radiation, other than visible light, are emitted in the universe and by detecting them we can get pretty detailed analysis.

Exercise 8

Solution 1

Solution 2

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Electromagnetic waves are involved in all devices that has the ability to connect wirelessly. Everyday items working and involving electromagnetic waves are tv remote, laptops, cell phones, wireless cameras, bluetooth speakers etc.

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Many devices involve electromagnetic waves such as: cell phone, lap top, remote controller etc.

All these devices have ability to connect wirelessly.

Result

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Cell phone, laptop, remote controller etc.

Exercise 9

Solution 1

Solution 2

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$textit{a.}$, X-rays are used in baggage screening.

$textit{b.}$, Ultraviolet light – Vitamin D

$textit{c.}$, Radio waves are used in radar communications.

$textit{d.}$, Infrared light – DVD player, remote control

$textit{e.}$, Microwaves are used in telecommunications.

$textit{f.}$, Gamma rays are used in cancer treatment.

$textit{g.}$, Visible light is used in theatre/concert effects

Result

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$textit{a.}$ Baggage screening

$textit{b.}$, Vitamin D

$textit{c.}$, Radar

$textit{d.}$, DVD player, remote control

$textit{e}$, Telecommunications

$textit{f.}$, Cancer treatment

$textit{g}$, Theatre/concert effects

Step 1

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a. X-rays are used in baggage screening.

Step 2

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b. Ultraviolet light – Vitamin D.

Step 3

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c. Radio waves are used in radar communications.

Step 4

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d. Infrared light is used is DVD player remote control.

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e. Microwaves are used in telecommunications.

Step 6

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f. Gamma rays are used in cancer treatment.

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g. Visible light is used in theater/concert effects.

Exercise 10

Solution 1

Solution 2

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Physical properties of light are:

Travelling in straight line, wave-like properties (direction, intensity, frequency, wavelength speed), transfer of energy, causing objects to cast shadows, travelling through the vacuum, high speed.

Result

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Travelling in straight line, wave-like properties (direction, intensity, frequency, wavelength speed), transfer of energy, causing objects to cast shadows, travelling through the vacuum, high speed.

Result

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Physical properties of light are its direction, intensity, frequency, wavelength, and its speed

Exercise 11

Solution 1

Solution 2

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White visible light can be dispersed into its seven colors using a prism. When light passes through a regular prism, it disperses into its seven colors.

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We can demonstrate that by using prism which which will cause dispersion of white light with which it has been enlighten.

During this process light of different colors will reflect different since they differ in wavelength.

Result

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By dispersion which is made by prism.

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Section 11-1: What is Light?

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