求解IR一题

ceci123321

Techniques

Island Museum analyzes historical artifacts using one or more techniques described below—all but one of which is performed by an outside laboratory—to obtain specific information about an object's creation. For each type of material listed, the museum uses only the technique described:

Animal teeth or bones: The museum performs isotope ratio mass spectrometry (IRMS) in-house to determine the ratios of chemical elements present, yielding dues as to the animal's diet and the minerals in its water supply.

Metallic ores or alloys: Inductively coupled plasma mass spectrometry (ICP-MS) is used to determine the ratios of traces of metallic isotopes present, which differ according to where the sample was obtained.

Plant matter: While they are living, plants absorb carbon-14, which decays at a predictable rate after death; thus radiocarbon dating is used to estimate a plant's date of death
Fired-clay objects: Thermoluminescence (TL) dating is used to provide an estimate of the time since clay was fired to create the object.

Artifacts

Island Museum has acquired a collection of metal, fired clay, stone, bone, and wooden artifacts found on the Kaxna Islands, and presumed to be from the Kaxna Kingdom of 1250-850 BC. Researchers have mapped all the mines, quarries, and sources of clay on Kaxna and know that wooden artifacts of that time were generally created within 2 years after tree harvest. There is, however, considerable uncertainty as to whether these artifacts were actually created on Kaxna.

In analyzing these artifacts, the museum assumes that radiocarbon dating is accurate to approximately ±200 years and TL dating is accurate to approximately ±100 years.

Budget

For outside laboratory tests, the museum's first-year budget for the Kaxna collection allows unlimited IRMS testing, and a total of S7,000— equal to the cost of 4 TL tests plus 15 radiocarbon tests, or the cost of 40 ICP-MS tests—for all other tests. For each technique applied by an outside lab, the museum is charged a fixed price per artifact.





For each of the following combinations of Kaxna artifacts, select Yes if, based on the information provided, the cost of all pertinent techniques described can be shown to be within the museum's first-year Kaxna budget. Otherwise, select No.

Yes	No
		2 bone implements and 5 fired-clay cups decorated with gold
		7 wooden statues and 20 metal implements
		15 wooden statues decorated with bone

正确答案 No, Yes, No



为什么不是NYY啊？？？？

prakashliu

楼主确定最后一个答案是NO啊，按理来说，15bones不算在预算内，15个wooden statues需要15次radiocarbon,应该是小于预算的啊。
第一题5个fired clay cups需要5个TL, 5个gold,需要5个ICPMS，不能确定是否超预算，所以选NO?

ceci123321

prakashliu 发表于 2013-5-5 22:38
楼主确定最后一个答案是NO啊，按理来说，15bones不算在预算内，15个wooden statues需要15次radiocarbon,应 ...

我跟你想的一样样的 %>_<%