Diagnostic ultrasound of frequency 4.10 MHz is used to examine tumors in soft tissue. (a) What is the wavelength in air of such a sound wave? (b) If the speed of sound in tissue is 1370 m/s, what is the wavelength of this wave in tissue? (Take the speed of sound in air to be 343 m/s.)

For a particular reaction, ? h = -144.6 kj and ? s = -301.2 j/k. calculate ? g for this reaction at 298 k.

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?