1. the bereau of land management manages over acres of land in the united states. a. 260 million b. 100 million c. 875 million 2. the wild was the main work animal of the mining industry. a. buffalo b. mustang c. burro 4. in the 1970s, horse thieves called hunted many horses to be used for dog food or for illegal sale. a. bandits b. varmints c. mustangers 5. wild deer eat small shrubs, while wild elk eat mainly a. grasses b. leaves c. berries 6. the desire of to feed from dumpsters and campgrounds has caused many problems. a. elk b. moose c. bears 7. yellowstone national park recently reintroduced native into the park after fifty years of removal. a. coyotes b. wolves c. cougars 8. what is the biggest consequence of ranchers allowing their cattle to overgraze? a. erosion b. pollution c. deforestation 9. the department of fish and wildlife believes that should be removed for a 5 year period to rebuild the native wildlife. a. deer and elk b. wolves and bears c. cattle and horses 10. agree that native wildlife should have the priority on federal land areas. a. congressmen b. environmentalists c. cattle rancher

1) A. 260 million 
2) C. burro 
3) B. Wild Horse Annie 
4) C. Mustangers 
5) A. grasses 
6) C. bears 
7) B. wolves 
8) A. erosion 
9) C. cattle and horses 
10) B. Environmentalists

10/10 (100%)

  remember that hf is only the energy of one photon. not two. not three. one.  1) 5.12 * 10^3 photons  find the energy of one photon, then determine how many photons are needed to reach the sensitivity.  e = hf  = (6.626 * 10^-34 js)(5.95 * 10^19 hz)  = 3.94247 * 10^-14 j per photon  (2.02 * 10^-10 j) / (3.94247 * 10^-14 j/photon) = 5123.69149 photons  round to three sig figs.  2) 5.77 * 10^-17 j  energy of pulse = energy per photon * number of photons  = hfn  = (6.626 * 10^-34 js)(1.66 * 10^13 hz)(5250)  = 5.774559 * 10^-17 j  round to three sig figs.  3) 4.07 * 10^8 kj/mol  10^12 pm = 1 m  c = fλ  f = c/λ  e = hf  = hc/λ  = [(6.626 * 10^-34 js)(3.00 * 10^8 m/s) / (2.94 * 10^-12 m)](1 kj/1000 j)(6.02 * 10^23 photons/mol)  = 40702571.4 kj/mol  round to three sig figs.  4) 9.94 * 10^-1 m  e = hc/λ  λ = hc / e  = (6.626 * 10^-34 js)(3.00 * 10^8 m/s) / (2.00 * 10^-25 j)  = 0.9939 m  round to three sig figs.  5) 9.06 * 10^3 photons  energy of pulse = energy per photon * number of photons  number of photons = energy of pulse / energy per photon  = energy of pulse / (hf)  = (3.87 * 10^-13 j) / [(6.626 * 10^-34 js)(6.45 * 10^16 hz)]  = 9055.23695 photons  round to three sig figs.  6) 2.78 * 10^-15 j  this is problem 1, except in reverse.  sensitivity = minumum number of photons * energy per photon  = (5930)(6.626 * 10^-34 js)(7.077 * 10^14 hz)  = 2.78070758 × 10^-15 j  round to three sig figs.