Calculate the minimum frequency of ultrasound (in Hz) that will allow you to see details as small as 0.496 mm in human tissue. (Assume the speed of sound through human tissue is 1540 m/s). What is the effective depth to which this sound is effective as a diagnostic probe?

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?

What kind of waves require a medium to travel? question 6 options: light waves mechanical waves all waves need a medium to travel electromagnetic waves

69. air frictionthe velocity of the satellitea. decreases b. increases c. sometimes increases sometimedecreases d. no effect at all70. the unit of gravitational potential energy isa.jouté b.watt c. newtond.pascal71. which of the following is not influenced by a magneta. cobalt b.copper c.irond. nickel72. one joule of work done in one second by unit positive chargea.1 watt b.1 volt c.1 js d. none73. the most deviated colour of light after passing through a prisea. violet b.red c. green d.yellow4. a coin is placed below a beaker fill with water upto 12 cm isdisplaced by water isa. 9cm b.6cmс.3cmd.7cm