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Science Test
Chapter's 17+18 questions
| Question | Answer |
|---|---|
| What produces electromagnetic waves? | The vibration of charged particles |
| What happens when electromagnetic waves encounter matter? | They slow down |
| What is the electromagnetic spectrum a range of? | Electromagnetic waves |
| What is the electromagnetic source organized according to? | Frequency and wavelength |
| True or false: Waves from the Sun do not require a medium for transmission. | True |
| True or false: As the frequency of an electromagnetic wave decreases, the wavelength decreases. | False: wavelength increases |
| True or false: All electromagnetic waves travel through space at the same speed. | True |
| True or false: Electromagnetic waves are also called transverse waves. | True |
| What is the electromagnetic spectrum? | It is the range of all types of electromagnetic waves that carry energy and travel through space at the speed of light |
| What wave has the longest wavelength and the lowest energy and shortest wavelength and highest energy? | Longest wavelength and lowest energy - Radio waves Shortest wavelength and highest energy - Gamma rays |
| What happens when wavelengths decrease? | The energy and frequency increase |
| How fast do all EM waves travel? | At the speed of light |
| What do radio waves do? | Used for radio's, TV's, and cell phones |
| What do microwaves do? | Used in microwave ovens and radar |
| What do UV waves do? | Comes from the Sun, and can cause sunburn |
| What do gamma rays do? | Used in cancer treatment and come from space |
| Why does a red apple appear red? | B/c the red apple absorbs all other light but the color red |
| When a light wave bends as they enter a new medium due to a change in what ? | Speed |
| When do light waves diverge? | When they pass through a convex lens |
| How can light be refracted using different colors? | By using a prism |
| True or false: A plane mirror is flat. | True |
| True or false: A real image appears at a location where no object exists? | False: it's a virtual image |
| True or false: The bowl of a spoon serves as a convex mirror when you look at your reflection. | False: It's a concave mirror |
| True or false: Concave mirrors can produce virtual and real images. | True |
| What is electromagnetic radiation that people can see? | Visible light |
| What are luminous objects? | Objects that produce and give off their own light |
| What is an illuminated object? | Objects that give off light that they do not produce |
| How do you see objects through an transparent material? | Clearly b/c the material allows almost all the light that strikes it to pass through and form a clear image |
| How do you see objects through an translucent material? | A blurry image b/c the material allows most but not all of the light that strikes it to pass through |
| How do you see objects through an opaque material? | Not at all b/c the material does not allow any light to pass through |
| True or False: Colors people see are due to the frequencies that enter their eyes. | False: wavelengths enter their eyes |
| What is a pigment? | A dye that absorbs certain colors of light and reflects others |
| What are the primary pigment colors and what color do you get in combining them? | Cyan, yellow, and magenta - you get black |
| What are the primary colors of light and what color do you get in combining them? | Green, blue, and red - you get white |
| Is the reflected image from diffuse reflection sharp and why? | No, b/c the light reflects back at a variety of angles |
| Is the image reflected from a plane mirror a virtual image and why? | Yes, b/c it looks similar to the object but is not a real image of the object / no image is located where the image appears to be |
| What happens to rays of light when they strike a concave mirror? | Rays of light that are parallel to the optical axis and strike a concave mirror are reflected so that they come together or converge at the focal point. |
| What does the image look like if the object is between the focal point and the mirror on a concave mirror? | Virtual and upright |
| What if the object is at the focal point of a concave mirror? | No image forms |
| What if the object is beyond the focal point of a concave mirror? | The image is real and inverted / upside down |
| What happens when light rays hit the outward curve of a convex mirror? | They spread apart or diverge |
| What kind of image does a convex mirror always produce? | A virtual image that is upright or smaller than the object |
| When does light change direction? | When it passes through one kind of medium into another |
| True or False: A medium in which light moves more slowly has a low index of refraction. | False: high index of refraction |
| When a ray of light travels at an angle to a faster medium than a slower medium, what happens? | The light ray bends toward the normal |
| Is a magnifying glass a concave or convex lens and where does it bend? | Convex and toward the optical axis and the normal |
| What color refracts the least and which refracts the most? | Least - red Most - violet |
| True or False: Colors of light that have a shorter wavelength and a higher frequency slow down more when they pass at an angle into a slow medium. | True |
| When does a rainbow form? | When sunlight passed through raindrops, which refract light the same way a prism does ; this causes the colors of light to spread out |
| Parts of the human eye do what? | Focus light and send signals to the brain |
| Cells where let you see color and shades of gray? | On the retina |
| What does it mean for a person to have normal vision? | Has a lens that focuses light directly onto the retina |
| What does it mean for a person to be nearsighted and how can they correct their vision? | an image forms in front of the retina; a person can correct their vision with a concave lens |
| What does it mean for a person to be farsighted and how can they correct their vision? | an image forms behind the retina; a person can correct their vision with a convex lens |
Created by:
J Dilly
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