Wondering if someone can please explain why this question is unsound; Given that v= frequency x lambda and the frequency of a wave under investigation is 15Ghz with a wavelength of 0.2m, select the correct answer below.

a. v= 7.5 x 10^1 0 m/s
b. None of these answers are correct.
c. v= 1.3 x 10^-11 m/s
d. The question is unsound.
e. v= 3x10^9 m/s

Which of the following is not am example of a polymer? protein nylon kevlar concreta

When an object is heated it contracts. a. true b. false

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.