Flashcards
Mid Unit Physics Test Revision
Flashcards do conjunto (26)
- 1What is energy?The ability to do work
- 2What is wave motion?Wave motion is the transfer of energy from one point to another through waves.
- 3What is a mechanical wave?A mechanical wave is a wave that needs a substance/medium to travel.
- 4What is an Electromagnetic wave?Electromagnetic waves are waves that are a form of radiant energy that do not need a medium to travel.
- 5What is the difference between an electromagnetic wave and a mechanical wave?Mechanical waves need a medium to travel whereas electromagnetic waves don't need a substance or medium.
- 6List the 7 types of Electromagnetic waves in order.Radio Waves, Microwaves, Infrared, Visible Light, Ultra Violet Light, X-rays, Gamma rays.
- 7List 2 uses for each.Radio Waves- TV broadcasting, Heart Rate Monitors
Microwaves- Microwave Ovens, GPS
Infrared- Night Vision Goggles, Remote Controls
Visible Light- Rainbows, Colour
UV Light- Black Lights, Water Disinfection
X-Rays- Medical Imaging, airport security
Gamma Rays- Cancer Treatment, Treating Wood Flooring. - 8How does light travel from one point to another?Points needed to be made:
Light travels in bundles called photons or in straight lines called rays
wave because disturbances in magnetic field.
Can travel like a vacuum through space
Light is electromagnetic - 9What is the difference between transverse and longitudinal waves?Transverse Waves are perpendicular and travel well in solids, but not in fluids like liquid or gas.
Longitudinal waves travel through all states of matter because their medium particles move parallel to the direction of the wave. - 10What are two examples of Transverse and Longitudinal waves?Transverse- Electromagnetic, Polarized
Longitudinal- Sound, seismic P waves - 11What is meant by the term frequency when applied to a wave?Frequency is the amount of times a 'cycle' is made within the wave.
- 12What is meant by the term period when applied to a wave?The time it takes for two successive wave crests to pass a given point.
- 13Explain what is meant by the terms Compression and Rarefaction as they apply to sound waves.Compression- A compression is a region in a wave where the particles are closest together.
Rarefaction- A Rarefaction is a region in a wave where the particles are furthest away from each other. - 14What is meant by the term acoustics?The properties or qualities of a room or building that determine how sound is transmitted in it.
- 15What substances absorb sound the best?Carpets, plush substances
- 16What substances reflect sound the best?Concrete, hard, flat surfaces
- 17What is an echo?A reflected sound that is heard distinctly separate from the original sound.
- 18What is meant by the term Reverberation?When multiple reflections of sound are too close together to be considered individual echoes.
- 19How does sonar work?A sound pulse is sent out and the reflection is then detected. By measuring the time between the initial pulse and the reflection you can calculate speed.
- 20How do you calculate speed?distance
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time - 21Where does reflection occur in a stethoscope?In-between the earpiece and diaphragm
- 22What is the law of reflection?For any reflected wave: The angle of incidence is equal to the angle of reflection. The reflected ray is also in the same plane as the incident ray.
- 23MIRRORSMIRRORS
- 24Describe characteristics of Plane Mirrors and examples1. Laterally Reversed (left to right)
2. Upright
3. Image the same size
4. Clear and un-distorted
5.. Appears to be behind mirror by same distance object is in front of mirror (virtual image)
EXAMPLES
Bathroom mirror
un-magnified cosmetic mirror - 25Characteristics and examples of convex mirrors.1. Clear, but distorted
2. Laterally Reversed (left to right),
3. Up right (right-side up)
4. Appears to be behind mirror (virtual), but farther away than a plane mirror.
5. Smaller than object. (Diminished)
EXAMPLES
Security mirrors
Car mirrors - 26Characteristics and examples of Concave mirrors1. Clear, but distorted
2. Laterally Reversed (left to right),
3. Up right (right-side up)
4. Appears to be closer than mirror.
5. Magnified
EXAMPLES
spoon
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- FlashCards sobre Mid Unit Physics Test Revision, criado por sarah_pryer em 24-08-2015.
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- sarah_pryer
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