A small radio speaker is suspended inside a spherical balloon. The balloon has a radius of 0.50 m. The power of the sound wave emitted from the speaker is 12 W. What is the intensity of the sound at the surface of the balloon? (The surface area [A] of the balloon is given by A=4πr2 .) Radio frequency diagram - Wave Characteristics 25

A.
2.5 W/m2
B.
3.8 W/m2
C.
5.5 W/m2
D.
6.4 W/m2

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?