Test
Light and Reflection: Speed, Shadows and Mirrors
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Preguntas del test (22)
1Light travels in [blank_start]straight lines[blank_end] at [blank_start]300,000,000[blank_end] m/s. It only changes direction when there is a change in [blank_start]material[blank_end]. Light is a type of [blank_start]energy[blank_end]. Light [blank_start]radiates[blank_end] out from a source.
- Astraight lines
- B300,000,000
- Cmaterial
- Denergy
- Eradiates
2[blank_start]Luminous[blank_end] objects gives out light however [blank_start]non-luminous[blank_end] objects are not sources of light. We see them as light from a luminous object [blank_start]reflects[blank_end] off the object into the eyes.
- ALuminous
- BNon-luminous
- Cnon-luminous
- Dluminous
- Ereflects
- Frefracts
3Light travels in [blank_start]straight[blank_end] lines so when an [blank_start]opaque[blank_end] object gets in the way of light a [blank_start]shadow[blank_end] is created. This is because light cannot travel around the [blank_start]opaque[blank_end] object.
- Astraight
- Bopaque
- Cshadow
- Dopaque
4What does it mean when an object is opaque?
- ALight can pass through it
- BLight can slightly pass through it
- CLight cannot pass through it
5Light travels [blank_start]quicker[blank_end] than sound.
- Aquicker
6How long does it take light to travel from the sun to the moon?
- A8 hours
- B8 mins
- C8 seconds
7Reflection is the change in [blank_start]direction[blank_end] of a wave at a [blank_start]surface[blank_end].
- Adirection
- Bsurface
8Concave mirrors are [blank_start]converging[blank_end]. Convex mirrors are [blank_start]diverging[blank_end]. Concave mirrors are used to [blank_start]focus[blank_end] light to a point and convex mirrors are used to [blank_start]spread out[blank_end] light.
- Aconverging
- Bdiverging
- Cfocus
- Dspread out
9The law of reflection states that the angle of [blank_start]incidence[blank_end] is equal to the angle of [blank_start]reflection[blank_end]. The law applies to any wave, not just light.
- Aincidence
- Breflection
10On a [blank_start]rough[blank_end] surface there will be an [blank_start]uneven[blank_end] reflection so the light is being [blank_start]scattered[blank_end].
- Arough
- Buneven
- Cscattered
11On a smooth surface there is an [blank_start]even[blank_end] reflection so the light will be reflected evenly.
- Aeven
12When light is being [blank_start]scattered[blank_end] off an uneven surface, it is known as [blank_start]diffuse reflection[blank_end]. When it is being smoothly reflected, it is known as [blank_start]specular[blank_end] reflection.
- Ascattered
- Bdiffuse reflection
- Cspecular
13If light is [blank_start]scattered[blank_end], we cannot see a clear image.
- Ascattered
14A [blank_start]translucent[blank_end] object will allow light to pass through it however it will be [blank_start]scattered[blank_end] so a clear image cannot be seen. [blank_start]Translucent[blank_end] objects often have rough surfaces.
- Atranslucent
- Bscattered
- CTranslucent
15When the angle of incidence is greater than the critical angle the light [blank_start]reflects[blank_end]. When it's less than the critical angle it [blank_start]refracts[blank_end] and when it's equal to it's critical angle light [blank_start]refracts[blank_end] at [blank_start]90 degrees[blank_end].
- Areflects
- Brefracts
- Crefracts
- D90 degrees
16Refraction is the change in [blank_start]speed[blank_end] of the wave due to the change in [blank_start]material[blank_end] which results in a change of [blank_start]direction[blank_end].
- Aspeed
- Bmaterial
- Cdirection
17 The refractive index is the [blank_start]ratio[blank_end] of velocity of light in a [blank_start]vacuum[blank_end] to its velocity in a [blank_start]specified medium[blank_end].
- Aratio
- Bvacuum
- Cspecified medium
18The formula to work out the refractive index of an object is [blank_start]n=cv[blank_end]
- An=cv
19What is it called when a surface takes in light without reflecting it?
- Aabsorption
- Brefraction
20The [blank_start]higher[blank_end] the refractive index the slower the rays will move and the more they will [blank_start]bend[blank_end].
- Ahigher
- Bbend
21[blank_start]Dispersion[blank_end] is the separation of white light into many different colours or any radiation according to their [blank_start]wavelengths[blank_end]. [blank_start]Red[blank_end] has the longest wavelength and [blank_start]violet[blank_end] has the shortest.
- ADispersion
- Bwavelengths
- CRed
- Dviolet
22The three primary colours are [blank_start]red[blank_end], green and blue. The secondary colours are magenta,yellow and [blank_start]cyan[blank_end].
- Ared
- Bcyan
Información
- Descripción
- Test sobre Sin título, creado por Lakshmi Lakshmanan el 22/03/2018.
- Autor
- Lakshmi Lakshmanan
- Idioma
- English
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