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41.3. Ultrasound, Infrasound and sound usage.

Check the correct answer!

Ventilators sound frequency is 18 Hz. What types of sound it this?
Grade:
8
Subject
Physics
Theme
Sound nowadays.
Subtheme
Ultrasound, Infrasound and sound usage.

Solve tasks to find hidden Geo point coordinates

  1. Algebra: Median
  2. Algebra: Relative frequency
  3. Geometry: Distance between parallel straight lines.
  4. Physics: Light reflection and mirrors.
  5. Algebra: Equation with unknown denominator.
  6. Chemistry: Substances physical properties and transformations.
  7. Geometry: Diameter, which is perpendicular to chord, properties.
  8. Algebra: Fractions main property
  9. Geometry: Area of parallelogram, rhomb, triangle, right angled triangle and trapeze.
  10. Algebra: Formula y = k/x
  11. Algebra: Numerical approximation.
  12. Geometry: Rectangular (S = ab, a, b - edges) and area of the square (S=a^2 , a - edge) formula.
  13. Chemistry: Atoms un ķīmiskie elementi.
  14. Geometry: Rectangle (S = ab, a, b - edges) and area of the square (S=a^2 , a - edge) formulas
  15. Geometry: Squar, properties and signs.
  16. Chemistry: Air composition and usage(reactions).
  17. Physics: Gravitation, friction and deformation.
  18. Geometry: Right-angled triangle outlined circle lines center location.
  19. Chemistry: Gas volume calculations
  20. Physics: Ultrasound, Infrasound and sound usage.
  21. Geometry: Triangle median properties.
  22. Algebra: Square root extraction
  23. Chemistry: Periodic table of chemical elements and atomic structure.
  24. Algebra: Fraction addition and subtraction.
  25. Algebra: Absolute and relative mistake of approximation
  26. Geometry: Rectangular (S = ab, a, b - edges) and area of the square (S=a^2 , a - edge) formula.
  27. Algebra: Actual numbers.
  28. Physics: Measurement.
  29. Physics: Spread of sound.
  30. Algebra: Parabola.
  31. Physics: mass
  32. Physics: Archimedes law.
  33. Algebra: Albraic fraction.
  34. Geometry: Curve angle value, center angle and indrawn angle.
  35. Algebra: Numerical approximation.
  36. Geometry: The Pythagorean Theorem. The practical application of Pythagorean Theorem in everyday life.
  37. Algebra: Square trinomial roots
  38. Geometry: Area of parallelogram, rhombus, triangle, right-angled triangle, trapeze.
  39. Algebra: Square trinomial distribution into multipliers
  40. Algebra: Rational fraction expression.
  41. Algebra: Moda
  42. Algebra: Fraction amplification and abbreviation.