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Science Test March 3
| Question | Answer |
|---|---|
| What is a wave? | A disturbance that carries Energy as it travels. |
| What type of wave does not require a medium? | Electromagnetic waves |
| Longitudinal wave | travel in the same direction as the vibrations that produce it side to side like a slinky (parallel). |
| Transverse wave | waves that move in a perpendicular direction (up and down). *Both are mechanical waves that require a medium |
| What is wave frequency? | The number of waves that pass a given point in a certain amount of time. |
| Reflection | When waves bounce off a surface. Ex: mirror, echo |
| Refraction | When waves bend due to changing speed (going from medium to another, like air to water) ex: looking at a pencil in water |
| Diffraction | Waves bending around a barrier ex:hearing someone talking from another room |
| Transmission | when waves pass through a surface ex: hearing a knock on your door |
| Absorption | when the energy of a wave transfers to the materials it comes into contact with (ex: wearing a dark shirt on a sunny day) |
| What is a “medium”? | Substance through which a wave can travel. |
| What type of materials and colors reflect light waves? | Shiny, metals, mirrors, light colors |
| Frequency (units) | Hertz |
| Wavelength (units) | Meters |
| Velocity (units) | Meters per Second |
| If waves don’t transfer matter, what do they transfer? | ENERGY |
| Explain what a light wave is. Does it require a medium? | An electromagnetic wave. Does NOT require medium. |
| Explain what a sound wave is. Does it require a medium? | A mechanical wave. DOES require a medium |
| What happens to sound if the amplitude of the wave is increased? | The volume of the sound increases. |
| Do light waves or sound waves travel faster? What is an example of this? | Light waves- thunder and lightning. |
| Describe the Doppler Effect. Give an example. | The change in frequency and pitch of the sound wave caused by motion. An ambulance driving past you- sounds louder when it’s right in front of you compared to when it drives past you. |
| What causes sound waves? | Vibrations |
| What type of signal is continuous? | Analog |
| What type of signal is more reliable to store and share information? Why? | Digital signals. They are less likely to be distorted by noise/interference. |
| What is the electromagnetic spectrum? | The entire range of electromagnetic waves from low frequency to high. |
| List the 7 electromagnetic waves in order of increasing frequency. | Radio waves, Microwaves, Infrared, Visible light, Ultraviolet, x-rays, Gamma. |
| Name one type of wave on the spectrum with a longer wavelength than infrared waves. | Microwaves or radio waves. |
| Which type of wave allows you to see bone? | X-rays. |
| Which type of wave allows you to see colors? | Visible light. |
| Which type of wave can cause skin cancer? | Ultraviolet. |
| What happens to the wavelength as the frequency increases? | It decreases |
| What color of visible light has the shortest wavelength? | Violet |
Created by:
30patels