y10 after mocks

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Across
  1. 4. – the area of the Earth's surface where seismographs cannot detect an earthquake after the waves have passed through the earth
  2. 5. – the alpha particle is the same as the nucleus of which element
  3. 7. - When waves change direction as they pass through a medium due to a change of speed which is due to a change in density of the material
  4. 8. –an electrical safety device made of a thin wire
  5. 9. - Force X distance in the same direction
  6. 12. - A quantity that has magnitude and direction
  7. 14. - The rate of transferring energy or the rate of doing work
  8. 18. – rate of flow of charges
  9. 20. - The maximum displacement of a point on the wave from its undisturbed (rest) position
  10. 24. - A system where neither matter nor energy can enter or leave
  11. 25. - The atomic model that suggested atoms were spheres of positive charges with negative electrons stuck in them is called the
  12. 26. – You need this to find the instantaneous speed of an accelerating object on a displacement – time graph
  13. 27. - It’s the velocity of a falling object at which the air resistance and weight are equal
  14. 28. - Low level radiation that is present at all times is call the _____ radiation
  15. 29. – unit for spring constant
Down
  1. 1. - the force acting on an object due to gravity
  2. 2. - the oscillations are parallel to the direction of energy transfer of the wave
  3. 3. - at high temperatures, its resistance drops
  4. 6. - The turning effect of a force
  5. 7. - a single force that can replace all the forces acting on an object to give the same effect as the original forces acting together
  6. 10. – the first letter of the colours of the spectrum, starting from the colour with the shortest wavelength
  7. 11. - If the resultant force on a moving object is zero, the object is not
  8. 12. – energy transferred per unit charge
  9. 13. - The distance a vehicle travel after the brakes are applied until it comes to a complete stop as a result of the braking force
  10. 15. – the beta particle is a fast moving _____
  11. 16. - The joining together of small nuclei to make larger nuclei (and energy is released)
  12. 17. – the unit for radioactivity
  13. 19. – unit of frequency
  14. 21. - element with the same number of protons but a different number of neutrons
  15. 22. - the collective term for protons and neutrons
  16. 23. - A component that only lets current flow in one direction