Earthquakes produce transverse waves that move slower than the p-waves. These waves are called secondary waves, or s-waves. If the wavelength of an s-wave is 2.3 x 104 m, its speed is 4500 m/s, what is its frequency?
*Include your units!
Round your answer to the nearest tenth (1 decimal place).

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.