Flashcards
Physics flashcards for GCSE Core science
Cards in this deck (28)
- 1What is wavelength? AND What is amplitude?Wavelength: The distance from one peek to the next.
Amplitude: The height of the wave (from the mid-line to the peek.) - 2What is frequency? AND How is it measured?How many complete waves there are in a second.
Measured in hertz (Hz)
1KHz=1000Hz
1MHz=1000000Hz - 3What do waves transfer?Energy and information without matter.
- 4What is the formula for speed, frequency and wavelength?Speed (v) = frequency (f) * wavelength
- 5What is the formula for wave speed, distance and time?Wave speed (f) = distance (m) / time (s)
- 6What is a transverse wave? AND What are examples of transverse waves?IS: The waves are at 90 degrees to the direction of travel.
E.g: water waves, seismic waves, light, EM spectrum
- 7What is a longitudinal wave? AND What are examples of longitudinal waves?Is: vibrations are along the same direction as the direction of travel.
E.g: Sound waves, ultra sound, P waves
- 8What is reflection?When a wave hits a boundary between one medium and another, some of its energy is reflected. Like when you look in a puddle and see yourself - light is reflected back at you.
- 9Why is light reflected?light is reflected because of the change in density.
Water is denser than air, so whenever a wave reaches a medium with a different density, some of the wave is reflected at the boundary. - 10What is refraction?When a wave crosses a boundary between two substances, for example, glass to air, it changes speed.
- 11What happens when a wave meets a different medium at a different angle?If a wave meets a different medium at a different angle, hits the denser layer first and slows down, it carries on at a faster speed, and the wave changes direction.
- 12What happens if a wave meets a boundary straight on?It slows down, but carries on in the same direction.
- 13What is an incident ray? AND What is a refracted ray? AND What is an emergent ray?Incident: A ray of light that strikes a surface. The angle between the ray and the normal is the angle of incidence.
Refracted: light when it's in the boundary between the two medium.
Emergent: The angel at which light comes out of a medium. - 14What is a real image?A real image is an image formed by actual rays of light. Real images are always inverted, and they may be either larger or smaller than the object
- 15What is a virtual image?When the rays are diverging, so the light from the object appears to be coming from a different place. Objects through magnifying glasses are like this. They appear to be further away than they are.
- 16What is a converging lens?A converging lens is convex. It causes parallel rays of light to move together, to a focus.
- 17What is the axis? AND What is the focal point?Axis: A line passing through the middle of a lens.
Focal point: Where rays hitting the lens parallel to the axis all meet. - 18Draw a ray diagram for an image through a converging lens.
- 19What will an object at 2F produce?A real, upside down image the same size as the object, and at 2F.
- 20What will an object between 2F and F produce?A real, upside down image bigger than the object and beyond 2F.
- 21What will happen if an object is nearer F ?No object will appear on screen, but will make a virtual image the right way up, bigger than the object, on the same side of the lens.
- 22What are the seven types of EM (electromagnetic) waves?Radio, micro, infrared, visible light, ultra violet, x-rays, gamma.
Tip: To remember Rabbits, Mate, In, Very, Unusual, 'Xciting, Gardens. - 23Who discovered infrared radiation?Herschel in 1800.
- 24Explain the test for measuring the EM spectrum using a prism.When white light goes through a prism, it creates a spectrum of colours. Using a thermometer to measure each colours temperature, there should be an increase from violate to red.
- 25How was infrared discovered?Using the prism method, if you measure the temperature past the red part of the spectrum, where there is no visible light, there is the highest temperature - infrared.
- 26Who discovered ultraviolet radiation?Ritter in 1801.
- 27How was ultraviolet radiation discovered?With the use of silver chloride, which turns black when exposed to light. It turned black at the highest speed, when exposed to the invisible rays at the violet end of the spectrum.
- 28How does a refracting telescope work?By bending light through a lens so that it forms an image.
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- Flashcards on Physics flashcards for GCSE Core science, created by jessicamair1999 on 30/04/2015.
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- jessicamair1999 · Apr 2015
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- Feb 19, 2016
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