Sound energies

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