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science chap. 2
chapter 2 of science grade 7
| Question | Answer |
|---|---|
| What is a wave? | a disturbance that transfers energy from place to place. |
| What causes waves? | Mechanical waves are produced when a source of energy causes a medium to vibrate. |
| what is energy? | the ability to do work. |
| What is a medium? | the material through which waves travel. |
| What are the basic properties of waves? | Aptitude, wavelength,speed and frequency. |
| What is a vibration? | a repeated back-and-forth or up-and-down movement. |
| What does an electromagnetic wave consist of? | vibrating electric and magnetic fields that move through space at the speed of light. |
| What is a crest? | the high point of a wave. |
| What is a trough? | The low point of a wave. |
| What is amplitude? | The maximum distance that particles of the medium carrying the wave move away from their rest positions. |
| What is a wavelength? | The distance between two corresponding wavelengths. |
| What is frequency? | The number of complete waves that pass a given point in a certain amount of time. |
| What is hertz? | What frequency is measured in. |
| What is an electromagnetic wave? | It transfers electrical and magnetic energy. |
| What is the electromagnetic spectrum? | the complete range of electromagnetic waves placed in order. |
| What is visible light? | electromagnetic waves that you can see. |
| What are the waves of the electromagnetic spectrum? (low to high) | Radio waves, microwaves, infrared rays, visible light, ultraviolet rays, x-rays, gamma rays. |
| How does visible light interact with an object? | When light strikes an object, the light can be reflected, transmitted, or absorbed. |
| What does a transparent material do? | it transmits most of the light. |
| What does a translucent material do? | It scatters light. |
| What does an opaque object do? | It reflects or absorbs all the light that strikes it. |
| What determines the color of an opaque object? | The color of the light it reflects. |
| What are the primary colors of light? | Red, green, and blue. |
| What are the primary colors of pigment? | yellow, cyan, and magenta. |
| What is a pigment? | colored substances that are used to color other materials. |
| What is reflection? | When an object or a wave bounces of an object it cannot pass. |
| What is the law of reflection? | The angle of incidence must equal the angle of reflection. |
| What is a plane mirror? | a flat sheet of glass that has a smooth, silvery coating on one side. |
| What is an image? | a copy of an object formed by reflected of refracted rays of light. |
| What is a virtual image? | Upright image that forms where light seems to come from. |
| What is a concave mirror? | A mirror with a surface that curves inward. |
| What is an optical axis? | an imaginary line that divides the mirror in half. |
| hat is the focal point? | The point at which rays parallel to the optical axis meet. |
| What is areal image? | It forms where rays actually meet. |
| What is a convex mirror? | A mirror with a surface that curves outward. |
| What is refraction? | The bending of light waves due to a change of speed. |
| Why do light rays bend when they enter a new medium at an angle? | The change in speed causes the rays to bend. |
| What is a lens? | A curved piece of glass |
| What is a convex lens? | Its thicker at the center and curved at the edges. |
| What is a concave lens? | Its thinner at the center and thicker at the edges. |
Created by:
anas999
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