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Across 4. reflected sound wave 5. a measure of the amount of matter in an object 10. property of light wave which is determined by its wavelength 12. used to detect small amount of emf 13. a solid having 6 square faces 14. part of a shadow from which all light is excluded 15. the rate of change of displacement 17. the product of the force and the time of contact between two bodies 20. a vector quantity that represents the rate of change in velocity 22. the mass per unit volume of a substance 24. scattering of white light behind an obstruction 26. bending of the light wave as it enters obliquely into another medium of a different density 27. the turning effect of a force on a body 29. number of revolutions or cycles completed by an object in a given time 31. force of attraction between two different molecules 32. distance from rest to a crest or from rest to a trough 35. the SI unit for work and energy which is equal to one newton-meter 36. total path length which is a scalar quantity 38. substances whose molecules have greater freedom of movement, enabling them to flow 39. reproduction of an object by a mirror or lens 40. transparent substance which has at least one nonparallel surface

Down 1. a common electric component used to convert electrical energy into heat 2. study of the effects of electricity and magnetism 3. is an upward acting force exerted by a fluid, that opposes an object's weight 6. amount of force that causes displacement of an object 7. part of a sphere which is curved inward toward an observer 8. a disturbance that travels through a medium 9. tendency of an object to persist in its state of rest or of uniform motion in a straight line 11. superimposition of two waves of lightproducing a loss of energy in certain cases. 16. device that can increase or decrease emf input 18. measure of force that acts at a certain area of an object 19. transfer of heat energy by electro magnetic waves 21. state or condition wherein there is no net force acting on an object 23. the property of some media to transmit light waves in a diffused manner to make object behind them undistinguishable 25. total space occupied by an object 28. parallel rays ofof light taken together as one 30. force of attraction between two similar molecules 33. portion of radiant energy visible to an observer 34. is the region in which only a portion of the light source is obscured by the occluding body 37. change in dimension that the object undergoes as a result of stress