Assume you have a circular 0.1m diameter dual frequency transducer 50/200 khz operating with peak output power of 4000w peak (500w rms) in shallow 60ft water assuming a back scattering coefficient of -15db, absorption coefficient of-3db and a fixed incident (look) angle of 20 degrees. assume vs = 1,495.5 m. s1, the source level of 145db, the noise level of 4db, and the ideal sea surface conditions. compute the return echo power (in db) for the a) low frequency beam b) high frequency beam, and c) compute the pulse length for a pulse rate of 0.5milliseconds for the high frequency beam [hint: pulse length is defined as lp = nc'x where the number of cycles nc = r'f for the pulse rate r ] where i ix a and a=2-r2

In the nineteenth century, gregor mendel first determined some basic rules of genetics that have been observed throughout all types of life. no observations have disproved these basic rules of genetics. charles darwin developed the idea of biological evolution around the same time, but he was unaware of mendel’s discoveries in genetics. over a century later, darwin’s idea of evolution was modified in order to incorporate mendel’s rules of genetics along with the other evidence that darwin had used. what is most likely the relationship between mendel’s rules of genetics and darwin’s idea of biological evolution? a.)mendel’s genetics states laws that are now part of the theory of biological evolution.b.)biological evolution states laws that are part of mendel’s theory of genetics.c.)mendel’s genetics replaced darwin’s entire concept of biological evolution.d.)biological evolution is a law that explains why all genetics exist.