Diagnostic ultrasound of frequency 4.80 mhz is used to examine tumors in soft tissue.
(a) what is the wavelength in the air of such a sound wave?
(b) if the speed of sound in tissue is 1500m/s, what is the wavelength of this wave in tissue? (hint: the speed of sound wave in air is always 343m/s)

Determine the maximum r-value of the polar equation r =3+3 cos 0

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )