PHYSICS 1A PHYSICS 1 - Physics B Module 8 Homework. Primavera - Online. Q&A

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Name: Jenna Montgomery

Physics B Module 8 Homework Directions: Complete the following problems showing all of your work. Turn in your completed worksheet to your teacher.

Short Answer 1. Explain the electromagnetic spectrum and some three examples of different applications of electromagnetic radiation.

The behavior of an electromagnetic wave in a substance depends on its frequency or wavelength.

The difference in behaviors of different groups in the electromagnetic spectrum make them suitable for a range of uses. Radio waves are used for communication such as television and radio.

Microwaves are used for cooking food and for satellite communications. Infrared light is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark.

2. Describe the three main types of mirrors and what sort of images they are likely to create.

Three common types of mirrors are the plane mirror, which has a flat, or plane, surface; the convex mirror; and the concave mirror. Flat mirrors reflect images in their normal proportions, reversed from left to right. Concave mirrors are spherical mirrors that curve inward like a spoon.

They create the illusion of largeness. Convex mirrors are also spherical mirrors. However, unlike concave mirrors, they bulge out and distort the reflected image, making it smaller.

3. Describe two types of lenses and the resulting images they form.

A convex lens is considered a positive lens because it causes light rays to converge, or concentrate, to form a real image. Concave lenses, on the other hand, are negative lenses because light waves passing through them diverge, or are scattered away from, a focal point or centerline. They create virtual images.

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4. Pick your favorite temperature scale and explain why you prefer it by using logical reasoning.

Fahrenheit is what I find easiest to use because I’ve grown up using it.

—Go on to the next page— 5. Explain how and why thermal expansion occurs, in your own words.

Thermal expansion occurs when an object expands because of an increase in its temperature.

Thermal expansion occurs because heated molecules move faster and take up more space.

6. In what situations can light bend?

If light enters any substance with a higher refractive index, it slows down. So, the light bends towards the normal line. If light travels into a substance with a lower refractive index it speeds up.

7. Describe how heat is transferred between two objects.

The mechanism in which heat is transferred from one object to another object through particle collisions is known as conduction. in conduction there is no net transfer of physical stuff between the objects.

Practice 8. A ray of light has a wavelength of 600 nanometers. What is its frequency?

499504245000000 hz

9. Which characteristic distinguishes between different regimes of the Electromagnetic spectrum?

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Electromagnetic waves have different wavelengths.

10. A ray of light passes from air (n = 1) to acrylic (n=1.3) at an angle of 20 degrees relative to the surface. What is the angle of refraction inside the acrylic?

15.25 deg

—Go on to the next page— 11. A virtual image is 3 meters behind a flat mirror and it is 2 meters tall. What is the height and distance from the mirror, for the object?

The height of the object is 2 meters and the distance of the object from the mirror is 3 meters.

12. A concave mirror has a focal length of 1 meter. An object is 2 meters from the mirror. What is the image distance from the mirror?

The image distance from the mirror is 2 meters.

13. A lens has a focal length of -10 cm. If the image of an object is located at -20 cm, what is the distance of the object?

-20 cm

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14. If you view an object with binoculars, and the image appears right side up and a dozen times larger, then what is the magnification of the binoculars?

Higher than 1

—Go on to the next page— 15. Convert the temperature of 73°F to degrees Celsius and Kelvin.

22.7778c 295.928k

16. A motor outputs 1000 J of energy in a given amount of time. 100 J is used to turn a rotor. How much heat energy is gained by the air around the engine?

He energy gained by the air around the engine is 900J.

Application A group of physics students are playing with lasers. The laser they have decided to use emits 400 nm wavelength of light.

17. What is the frequency of that light?

749256367500000 hz

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18. If the students shine the laser at a flat mirror, at an angle of 20° with respect to the surface, what angle should they expect from the reflected ray?

160

—Go on to the next page— 19. This laser light bounces from a mirror, continues through air, n = 1.0, to a piece of glass, n = 1.5, at an angle of 25° from the normal. What will be the lasers refracted angle inside the glass?

16.36 deg

20. The laser then goes towards a lens, but the laser light is PARALLEL to the optical axis of the lens. The lens has a focal point of 0.5 meters. Where will the laser light CROSS the optical axis?

The laser light crossed the optical axis at 0.5 m.

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