The human ear is most sensitive to sound that has a frequency of about 4000 hz. assume that the speed of sound in air is 340 m/s.
what is the wavelength of a sound heard in the air with this frequency?
a. 0.043 m
b. 0.085 m
c. 12 m
d. 340 m

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

Researchers determine that the biodiversity in a woodland region is declining. they identify two major threats to the region's biodiversity, a method to address each threat, and the expected outcome of each method. this information is shown in the table. a) reforestation would not benefit many species because most forest species live on the ground. b) reforestation would take the longest time to be effective because trees take several years to grow. c) biological augmentation would benefit only a few species because is is typically not very effective. d) biological augmentation would take less time to ve effective because it targets the majority of prey species.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer