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  • The solved tasks turn into coordinates
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  • Along with your schoolmates and friends, go on an adventure, searching for hideouts
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39.1. Sounds reception.

Tick the correct answer(more than one answer is possbile)!

The cat's ear oscillation frequency of the sound waves is from 100 Hz to 32 kHz, but the dogs are able to receive sounds in the range from 40 Hz to 46 kHz. Which frequency sound can both dogs and cats hear?
Sound nowadays.
Sounds reception.

Solve tasks to find hidden Geo point coordinates

  1. Chemistry: Substance consistent invariables. Chemical formulas.
  2. Chemistry: Acids, bases and salts chemical formulas and names.
  3. Algebra: Arithmetic square root
  4. Algebra: Proportions, percent
  5. Algebra: Numerical approximation.
  6. Algebra: Rational expression.
  7. Physics: Physics language.
  8. Geometry: Polygon angle sum, convex or concaved quadrangle, polygon diagonale.
  9. Geometry: Parallelogram, elements. Properties and signs.
  10. Physics: Gravitation, friction and deformation.