Answer the following question given this paragraph: prepared. A student measures the radioactivity of this source with a Geiger counter and observes 1500 counts per minute. She notices that the source was prepared 120 days before her lab. What fraction of the decays is she observing with her apparatus? (b) Identify some of the reasons that only a fraction of the s emitted are observed by the detector. Armor-piercing shells with depleted uranium cores are fired by aircraft at tanks. (The high density of the uranium makes them effective. ) The uranium is called depleted because it has had its 235 U removed for reactor use and is. Q: What 'counting' instrument is used to measure radioactivity? Choices: - Liquid Counter - ellie counter - pryor counter - geiger counter A:
geiger counter
Answer the following question given this paragraph: Unsaturated hydrocarbons have at least one double or triple bond between carbon atoms, so the carbon atoms are not bonded to as many hydrogen atoms as possible. In other words, they are unsaturated with hydrogen atoms. Q: When carbon atoms are not bonded to as many hydrogen atoms as possible, what kind of hydrocarbon results? Choices: - unstable - aqueous - saturated - unsaturated A:
unsaturated
Q: Answer the following question given this paragraph: Reflection of light occurs when light bounces back from a surface that it cannot pass through. If the surface is very smooth, the reflected light forms an image. Q: What is the process where light bounces back from surfaces that it cannot pass through? Choices: - diffraction - direction - absorbtion - reflection A:
A: reflection
Question: Answer the following question given this paragraph: If you are a typical teenager, you like to eat. For your body to break down, absorb and spread the nutrients from your food throughout your body, your digestive system and endocrine system need to work together. The endocrine system sends hormones around your body to communicate between cells. Essentially, hormones are chemical messenger molecules. Q: What are the "chemical messenger" molecules used by the endocrine system? Choices: - acids - axons - enzymes - hormones A:
Answer: hormones
*Question*
Answer the following question given this paragraph: This giant Buddha statue, which is a national treasure in Japan, is made of bronze. Bronze consists mainly of copper but also contains some tin. Bronze is an example of a solution. A solution is a type of mixture that has the same composition throughout. Q: What do you call a type of mixture that has the same composition throughout? Choices: - transition - structure - transfusion - solution A:
**Answer**
solution
(Question)
Answer the following question given this paragraph: Radiocarbon is useful for relatively young, carbon-based materials. Other longer-lived isotopes are good for older rocks and minerals. Q: Radiocarbon is useful for dating relatively young materials with what element as their base? Choices: - hydrogen - oxygen - nitrogen - carbon A:
(Answer)
carbon