Across
- 2. the visible portion of the ear, which serves as a protective organ for the eardrum.
- 3. a global network connecting millions of computers.
- 4. the number of complete vibration passing a given point per unit of time.
- 9. Nerve The electrical impulses, generated by the nerve cells, are then passed to the brain.
- 10. repeated sound brought about by the reflection of sound waves from surface.
- 11. the innermost portion of the ear.
- 12. a general term for a vast array of technologies that send information over distances.
- 13. sound waves may be reflected from walls, mountains, ground and other object.
- 14. a piece of equipment that combines many channels before sending out on a communication system.
- 15. a telecommunications device that converts sound, typically the human voice, into electronic signals suitable for transmission via cables or other transmission media over long distances.
- 17. given the credit of inventing telephone.
- 21. supplies services that are shared by all telephone units.
- 23. distance between 2 corresponding points on a wave train.
- 25. highest or lowest displacement from a waves equilibrium position.
- 26. the long-distance transmission of messages without the physical exchange of an object bearing the message.
- 27. an alphabetic code of long and short sounds, originally transmitted by telegraph.
- 31. repeated sound reflection.
- 34. the outer ear and the inner ear, perceives sound waves from the outer ear in the form of pressure waves.
- 35. the spiral tube is a rolled structure that can stretch to about 3 cm.
- 39. an organ of the auditory system, which is responsible for the sense of hearing.
- 40. underwater system for detecting and locating objects by means of echo.
Down
- 1. the transmission and reception of meaningful information.
- 5. allow the ear to distinguish sounds which have the same pitch and loudness.
- 6. vibrates as soon as it receives sound waves, and transforms the sound energy into mechanical energy.
- 7. discovered doppler effect.
- 8. These are fluid-filled loops, attached to the cochlea and help in maintaining the balance.
- 16. the name for communication channels connecting two central offices.
- 18. sensation in the ear which depends on the energy in the sound wave.
- 19. a matrix of possible paths between telephone lines.
- 20. happens because distance affects the amount of time it takes you to hear the sound.
- 22. occurs when waves of different frequencies from 2 sources are produced at the same time.
- 24. number of waves you are sending out per second.
- 28. occurs when sound passes from one medium to another.
- 29. consists of a computer and associated equipment.
- 30. spreading out of sound waves as they pass through a gap.
- 32. channels the waves to your eardrum, a thin, sensitive membrane stretched tightly over the entrance to your middle ear.
- 33. vibrating bodies that send out energy causing forced vibration in air and solid objects.
- 36. a tiny bone, located next to the eardrum.
- 37. another tiny bone next to hammer; it vibrates in response to the vibration of hammer.
- 38. travels in form of wave and is formed by any vibrating bodies.