The galileo space probe was launched on its long journey past several planets in 1989, with an ultimate goal of jupiter. its power source is 11.0 kg of 238 pu , a by-product of nuclear weapons plutonium production. electrical energy is generated thermoelectrically from the heat produced when the 5.59-mev α particles emitted in each decay crash to a halt inside the plutonium and its shielding. the half-life of 238 pu is 87.7 years.

(a) what was the original activity of the 238 pu in becquerel?
(b) what power was emitted in kilowatts?
(c) what power was emitted 12.0 y after launch?

Gam radio signals can usually be heard behind a hill, but fm often cannot. that is, am signals bend more than fm. explain. (radio signals, as we shall see, are carried by electromagnetic waves whose wavelength for am is typically 200 to 600 m and for fm about 3 m.)

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.

Question 1 of 15 2 points when doing science as inquiry, you should have some idea of what you think the final result will be. o a. true o b. false submit