Nelson Science Perspectives 10
1st Edition
ISBN: 9780176355289
Textbook solutions
All Solutions
Section 11-3: The Laser?A Special Type of Light
Exercise 1
Solution 1
Solution 2
Step 1
1 of 2
Three properties that make laser light different from light emitted by an incandescent bulb of a flashlight are:
1., waves of laser travel in group in the same direction
2., its light does not extend during the travelling
3., each wave that forms laser light has the same energy which means that they have same wavelength and color as well.
Result
2 of 2
1., waves of laser travel in group in the same direction
2., its light does not extend during the travelling
3., each wave that forms laser light has the same energy which means that they have same wavelength and color as well.
Step 1
1 of 3
Incandescent bulbs emit light composed of electromagnetic waves of different wavelengths while laser produce light of one wavelength only.
Step 2
2 of 3
Incandescent bulbs emit light wavelengths in all directions while laser produce light travelling in the same exact direction. It is for this reason that laser is considered to be very intense and can even cut layers of metals.
Step 3
3 of 3
Light emitted by incandescent bulbs is composed of all colors (of visible light) while laser is monochromatic in nature. What this means is that it is composed of one color only.
Exercise 2
Solution 1
Solution 2
Step 1
1 of 2
A laser with green light will remain green light on leaving the prism. This is because laser lights are monochromatic in nature and therefore will/can not disperse to any mixture of colors.
Result
2 of 2
A laser with green light will remain green light on leaving the prism.
Step 1
1 of 2
When a laser with green light is shone at a triangular prism, color of the light which is leaving the prism will remain green, since laser lights are monochromatic, which means that they cannot disperse.
Result
2 of 2
Green color, because laser light is monochromatic.
Exercise 3
Solution 1
Solution 2
Step 1
1 of 2
a. Laser light travels in a single direction, concentrated in a single narrow beam of light that has the ability to remain narrow throughout the course of its travel without spreading out. It is for this reason that laser lights are used to determine long distances with greater accuracy.
Step 2
2 of 2
b. White light spreads out and diffuses during the course of its travel, therefore it is not recommended to use white light to measure distances instead of lasers no matter how narrow, intense and strong it seems.
Step 1
1 of 2
$textit{a.}$,Waves that form laser light are all concentrated in a single narrow beam which is travelling in one direction.
Narrow beam of light will not expand while travelling which is why it is being used in measuring great distances.
$textit{b.}$, It is not used because white light diffuses and expands during the travelling, and strengths and intensity of the narrow has to do nothing with that.
Result
2 of 2
$textit{a.}$, Because narrow beam of the laser light is travelling into one direction and does not expand.
$textit{b.}$, Narrow beam of the white light diffuse and expands during the travelling.
Exercise 4
Solution 1
Solution 2
Step 1
1 of 2
We should never look directly at a laser beam since laser light is formed of rays of light with the same wavelength and there is an intense beam of light and when in contact with lens, beam will be focused onto the retina which can be damaged in that case.
Result
2 of 2
It is dangerous since lens focuses beam of light into the retina, and since beam is intense, the retina can be damaged.
Result
1 of 1
Laser light is composed of lights waves of a single wavelength, color and energy which travel in the same direction as a narrow and intense beam of light, therefore it is not recommended to directly look at a laser because its intensity can be damaging to the retina of the eye.
Exercise 5
Step 1
1 of 2
Result
2 of 2
As we can see on the diagram narrow beam of the white light expands during the travelling, and in the case of laser light it travels only into the one direction, it does not expand.
Exercise 6
Solution 1
Solution 2
Step 1
1 of 2
Applications of lasers:
1., surgery
2., cutting metals
3., welding
5., barcode scanning
Result
2 of 2
1., surgery
2., cutting metals
3., welding
5., barcode scanning
Step 1
1 of 1
Lasers are used in:
1. cutting metals
2. drilling
3. weldings
4.hospitals for some small surgeries
1. cutting metals
2. drilling
3. weldings
4.hospitals for some small surgeries
unlock