Sound energies

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Across
  1. 7. These are a type of electromagnetic radiation with the longest wavelengths in the electromagnetic spectrum
  2. 8. it is a technique for detecting and determining the distance and direction of underwater objects by acoustic means.
  3. 10. It determines the maximum intensity of its field quantities.
  4. 11. It is the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
  5. 12. It is the opposite of a crest, so the minimum or lowest point in a cycle.
  6. 13. is a type of elementary particle that serves as the quantum of the electromagnetic field, including electromagnetic radiation
  7. 15. Reduction in the density in something, especially in air or a gas
  8. 18. It is the combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled.
  9. 19. These are a form of "electromagnetic" radiation; that is, they are waves of electrical and magnetic energy moving together through space.
  10. 20. the segment of the electromagnetic spectrum that the human eye can view.
Down
  1. 1. It is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei.
  2. 2. the throwing back by a body or surface of light, heat, or sound without absorbing it.
  3. 3. It is a sound that is repeated because the sound waves are reflected back.
  4. 4. it is electromagnetic radiation with wavelengths longer than those of visible light.
  5. 5. It is the change in direction of a wave passing from one medium to another or from a gradual change in the medium.
  6. 6. The distance between identical points in the adjacent cycles of a wave signal propagated in space or along wire
  7. 9. It is the maximum value of upward displacement within a cycle.
  8. 14. the number of a repeating event per unit
  9. 16. It is situated beyond the visible spectrum at its violet end —used of radiation having a wavelength shorter than wavelengths of visible light and longer than those of X-rays.
  10. 17. It is a relatively large selective response of an object or a system that vibrates in step or phase, with an externally applied oscillatory force