Multiple Choice 2015-16
Question
Answer
Mislead1
Mislead2
Mislead3
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What is the maximum displacement of a wave called?
The maximum displacement is called the amplitude.
The maximum displacement is called the amplitude.
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How is the wavelength of a wave measured?
Peak-to-peak or trough-to-trough.
The distance between like places on a wave, such as peak-to-peak or trough-to-trough, is known as the wavelengths. Wavelength is measured in metres (m).
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What do waves usually transfer?
Waves transfer energy from place to place.
Waves transfer energy from one place to another, but generally not matter (particles).
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Why are water waves and light waves described as 'transverse'?
Water waves and light waves are transverse waves, because the displacement is perpendicular to the direction of the wave.
Water waves and light waves are transverse waves, because the displacement is perpendicular to the direction of the wave.
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What is refraction?
When light (or waves) waves change speed they change direction. This is called refraction.
When light (or waves) waves change speed they change direction. This is called refraction.
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Why can light travel through a vacuum?
Light waves can travel everywhere including through a vacuum due to the fact that they don't need particles in order to travel.
Light waves can travel through a vacuum.
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What is another name for light?
Light is also known as electromagnetic radiation.
Light is called electromagnetic radiation.
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What happens when all the colours of light mix?
When different colours of light mix they combine to form white light.
When all colours of light mix they add up to form white light.
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Why are the colours of white light separated in a rainbow?
The different colours of light bend different amounts. Red is bent the least, Violet is bent the most.
The different colours of light are refracted (bend) different amounts. Red is refracted the least, Violet is refracted the most.
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Why do different colours of light bend different amounts?
They all have different frequencies.
The different colours have different frequencies of light.
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How does the frequency of light affect how much is it bent by a prism?
The higher the frequency of light, the more it is bent by a prism.
The higher the frequency of light, the more it is refracted by the prism.
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How do light waves travel if not by particles?
Light waves are displacements in electrical and magnetic fields.
Light waves do not involve particles, they are displacements in electrical and magnetic fields.
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How does frequency affect the energy of a wave?
The higher the frequency the higher the energy of the wave.
The higher the frequency the higher the energy of the wave.
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How do the frequencies of red visible light and violet visible light compare?
Red has the lowest frequency (of visible light). Violet has the highest frequency (of visible light)
Red has the lowest frequency (of visible light). Violet has the highest frequency (of visible light)
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What is the speed of light in a vacuum?
The speed of light through a vacuum is always 3x10^8 m/s
The speed of light through a vacuum is always 3x10^8 m/s
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How do the energies of red visible light and violet visible light compare?
Red has the lowest energy (of visible light). Violet has the highest energy (of visible light).
Red has the lowest energy (of visible light). Violet has the highest energy (of visible light)
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What happens when colours of paint are mixed?
When colours of paint are mixed they subtract to form brown
When colours of paint are mix they subtract, forming brown.
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What three things can happen to a wave when it encounters a material?
When a wave encounters a material it is either: reflected, absorbed or transmitted.
When a wave encounters a material it is either: reflected; absorbed or; transmitted
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How do light waves travel?
Light (waves) travels in straight lines. We use rays to show this.
Light (waves) travels in straight lines. We use rays to show this.
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What is the law of reflection off a plane surface?
When a wave is reflected from an object like a mirror, the angle of reflection equals the angle of incidence.
When a wave is reflected from an object like a mirror, the angle of reflection equals the angle of incidence.
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What is the symbol of a mirror for ray diagrams?
The symbol for a mirror in ray diagrams is a straight light with perpendicular lines on the back side.
Use of ray model to explain imaging in mirrors
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What is it called when a wave hits a flat, shiny surface and bounces back?
When a wave hits an object like a mirror, and bounces back it is called specular reflection.
When a wave is reflected from an object like a mirror, it is called specular reflection.
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How does specular reflection allow an image to be formed?
In specular reflection rays are reflected at a consistent angle, allowing an image to be formed.
In specular reflection rays are reflected at a consistent angle, allowing an image to be formed.
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When does diffuse scattering occur?
Diffuse scattering occurs when rays are reflected from a surface in a variety of angles.
Diffuse scattering occurs when rays are reflected from a surface in a variety of angles.
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Why does a red object look red in white light?
A red object only reflects red light back to the observer. It absorbs all other colours.
Differential colour effects in absorption and diffuse reflection
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How can you split white light?
You can split white light up by passing it through a glass prism. The different coloured light will travel through the glass at different speeds, separating it out.
Mini enquiry into the effects of refraction.
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What are the components of the eye?
The eye consists of an: iris; pupil; cornea; lens; retina; and optic nerve.
The eye consists of an: iris; pupil; cornea; lens; retina; and optic nerve.
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How does light enter the eye?
Light enters the eye through the pupil.
Light enters the eye through the pupil.
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Why does the pupil change size?
The pupil changes size to keep the amount of light energy entering the eye constant.
The pupil changes size to keep the amount of light energy entering the eye constant.
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How is a focused (clear) and bright image produced by the eye?
Light is refracted so that rays of light from the one place on the object reaches only one place on the retina. This creates a focused (clear) and bright image.
Light is refracted so that rays of light from the one place on the object reaches only one place on the retina. This creates a focused (clear) and bright image.
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Why are the cornea and lens convex in shape?
The cornea and the lens are convex in shape and so focus the light.
The cornea and the lens are convex in shape and so focus the light.
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What does a lens do to the image of an object?
A lens can be used to form a bright, focused image.
A lens can collect the rays that enter it and concentrate them to a single point on the screen, forming a bright, focused image.
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How do they specialised cells detect changes in light energy in the eye?
The retina has specialised cells that sense / detect light energy by having chemicals that are destroyed when they absorb the light energy.
The retina has specialised cells that sense / detect light energy by having chemicals that are destroyed when they absorb the light energy.
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How does the eye inform the brain what you see?
The cell uses the amount of chemical left to send a message to the brain in the form of electrical energy.
The cell uses the amount of chemical left to send a message to the brain in the form of electrical energy.
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What does a ray model of a pinhole camera look like?
http://www.cbakken.net/obookshelf/camera.html
Use of ray model to explain imaging in pinhole cameras.
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With photosensitive paper where does light transfer from and to?
Light transfers energy from source to absorber.
Light transfers energy from source to absorber.
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What things can absorbed light energy do in a polaroid camera lead to?
The energy absorbed can lead to chemical effects such as photosensitive chemicals in photo films.
The energy absorbed can lead to chemical effects such photosensitive chemicals in photo films.
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How does a pinhole camera create a faint image that is in focus?
A pinhole camera creates a faint image that is in focus because only a single ray can enter the camera so there is not much light so the image is dim, but only image is formed so it is clear (focused) image.
With one small hole, a pinhole camera gives a faint image that is in focus. This is because only a single ray can enter the camera so there is not much light so the image is dim, but only image is formed so it is clear (focused) image
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What can absorbed light energy lead to in the eye?
The energy absorbed can lead to chemical changes in cells such as those in the back of the eye.- the retinia.
The energy absorbed can lead to chemical changes in cells such as those in the back of the eye.- the retenia.
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Why does having three small holes in a pinhole give three faint images that are in focus?
With three small holes, a pinhole camera gives three faint image that are in focus. It works in the same way as a single hole, but a different angle so the images are offset from each other.
With three small holes, a pinhole camera gives three faint image that are in focus. It works in the same way as a single hole, but a different angle so the images are offset from each other.
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Where is the light reflected in the eye?
Light is refracted first by the cornea and then by the lens.
Light is refracted first by the cornea and then by the lens.
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What can happen to a charged surface when light energy is absorbed?
When light is absorbed by a charged surface, the charge can leak away.
When light is absorbed by a charged surface, the charge can leak away.
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How does a bigger hole effect the image produced?
A big hole can be thought of as thousands of small holes joined together. So thousand of images are produced on the screen slightly offset from one another forming a blurred, out of focused image.
With a large hole, a pinhole camera gives a bright out of focus image. A big hole can be thought of as thousands of small holes joined together. So thousand of images are produced on the screen slightly offset from one another forming a blurred, out of focused image.
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How can a picture be made using a CCD?
If a charged pixel is exposed to light, then the charge can be measured by a circuit to indirectly measure the amount of light that had fallen on it.
The change in electrical charge can be measured by a circuit to produce a picture. ie a digital camera sensor (CCD)
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Mod
Number of Questions
0S
10
1B
10
1C
10
1P
10
BI
5