Science Revision Cards

This is a set of cards which will help you revise for your forth coming exams. These cardds will consist of questions and answers of the material you'll need to know to pass the exam.

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  • Created by: Riken
  • Created on: 25-04-11 13:42

Question

What is an Isotope?

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Answer

Atoms of an element that contain different numbers of neutrons in their nuclei.

REMEMBER: Isotopes always have 6 protons but different numbers of neutrons.

e.g. Carbon 12           Carbon 14

       6 protons             6 protons                                                                                    6 neutrons           8 neutrons

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Question

What do I mean when I "decomission" a power plant?

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Answer

To decomission a powerplant is where you dismantle and remove radioactive material (waste) safely.

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Question

What is the "Big Bang" theory?

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Answer

  • This is the theory that the universe was created in a massive explosion (the big bang).
  • The universe has been exanding ever since this explosion.
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Question

What is the "Red Shift"?

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Answer

  • redshift happens when light seen coming from an object is proportionally increased in wavelength, or shifted to the red end of the spectrum. More generally, where an observer detects electromagnetic radiation outside the visible spectrum, "redder" amounts to a technical shorthand for "increase in electromagnetic wavelength" — which also implies lower frequency and photon energy in accord with, respectively, the wave and quantum theories of light.
  • The faster the speed of the star or galaxy the greater the redshift.
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Question

What is the equation for efficiency?

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Answer

Efficiency = useful energy suppied by motor / total energy supplied by motor

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Exam Question

What type of wave is used to send information to and from satelites?(1 mark)

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Answer

Microwaves

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