Science
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| A Sidereal day is ...... | The time taken for the earth to spin 360 degrees (or the time to see a star in the same position in the sky)
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| The length of a sidereal day is... | 23 hours 56 minutes
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| A sidereal day occurs because.... | The earth is moving around the sun so its position changes in relation to other stars.
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| A solar day is.... | The time taken for the sun to appear in the same position in the sky
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| The length of a solar day is .... | 24 Hours
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| The length of time for the moon to eturn to the same position in the sky.... | 25 hours
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| The reason why the stars appear to move in the sky... | Because the direction we face changes slighty each day.
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| The reason why the moon appears to shine ..... | it reflects the suns light (only the side facing the sun is lit up the other side is in shadow)
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| When do we see a full moon ? | When the whole of the lit up surface is facing us.
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| When do we see a new moon ? | when the side in shadow is facing us
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| When do eclipses happen ? | When light from the sun is blocked
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| The two main types of eclipses ? | Lunar and Solar
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| A Lunar eclipse occurs when... | the moon passes into the Earths shadow
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| A solar eclipse occurs when ... | The moons shadow falls on the Earth
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| The reason why eclipses dont happen very often is because.... | The moon orbits the earth at a slight angle.
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| The year of the next total solar ecclipse visiable from the uk | 2090
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| The star that doesn't seem to move when viewed from the earth is... | Pole star
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| The reason the pole star doesn't appear to move is... | because it is directly above the north pole and therefore the spin axis of the earth
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| The imaginary plane running across the sky extending from the earths equator is... | The celestial equator.
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| The distance a star moves upwards (celestial latitude) | Declination
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| The distance a star moves across the sky (celestial longitude) is called.. | Right Ascension
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| The imaginary line passing through the centre of a lens is called the.... | principal axis
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| The number of focal points in each lens | 2 (one in front and one behind the lens)
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| The distance between the middle of the lens and its focal point is called.... | the focal length
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| Focal length is related to... | Power
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| 1. The more powerful the lens the.... | more strongly it converges rays of light.
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| 2. The more powerful the lens... | the shorter the focal length.
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| Power = | 1/focal length
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| 3. The more powerful the lens... | the more strongly curved the surfaces
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| An image formed where light rays appear to have come from is called a ... | Virtual image
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| A simple refracting telescope uses... | 2 converging lenses
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| Magification = | focal length of objective lens / focal length of eye lens
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| Most astrnonical telescopse use .... | a concave mirror
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| Concave mirrors are like a portion of a ... | sphere (the centre of the sphere is the centre of curvature or C)
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| Halfway between the centre of curvature vertex is .... | the focal length
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| calculating magnification with powers = | power of eyepiece / power of objective lens
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| The distance to nearby stars can .... | be measured by parallax
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| 1 arcsec = | 1/3600 degrees
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| 1 parsec = | 3 light years approximately
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| distace in parsecs= | 1 / angle in arcsecs
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| Observed brightness depends on ... | the intrinsic brightness of the star and its distance from the veiwer.
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| Speed of recession of distance galaxies (km/s)= | Hubble constant x distance
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| The value of the hubble constant is roughly.... | 2 x 10-18 (10 to the minus 18)
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| If you increase the temperature of something you... | give the particles more kinetic energy.
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| the way to convert degrees celcius to kelvins is... | add 273
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| A decrease in volume of a gas results in.. | an increase in pressure (if temperature remains constant)
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| An increase in temperature of a gas results in.. | an increase in pressure (if volume stays constant)
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Created by:
garethphillips3
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