• The learning process is entertaining and exciting
  • The solved tasks turn into coordinates
  • The chance to follow your progress
  • Along with your schoolmates and friends, go on an adventure, searching for hideouts
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43.3. Ultrasound, Infrasound and sound usage.

Write the answer!

Write the correct answer!

Sea depth is determined with formula h=\frac{vt}{2}, where v is speed of sound in water, t is time between the forming of impulse and its receiver. What is the depth in place, where between signals radiation and receiver are 4 seconds? Speed of sound in water is 1500 m/s.
Sound nowadays.
Ultrasound, Infrasound and sound usage.

Solve tasks to find hidden Geo point coordinates

  1. Algebra: Fraction multiplication and division.
  2. Geometry: Parallelogram, its elements. Properties and signs of parallelogram
  3. Algebra: Average arithmetical
  4. Geometry: Squar, properties and signs.
  5. Geometry: Diameter, which is perpendicular to chord, properties.
  6. Geometry: Rectangular, properties and signs.
  7. Physics: Physics language.
  8. Chemistry: Air composition and usage(reactions).
  9. Algebra: ax² + bx = 0
  10. Algebra: Formula y = k/x