Arthur is testing how well various types of disinfectants can kill e. coli bacteria. he starts with a petri dish that is covered with e. coli. he puts exactly one milliliter of each different disinfectant at a different location on the petri dish. if a disinfectant works, it will eliminate the bacteria in the area in which it was placed. two days later, arthur will measure the amount of bacteria that has been cleared out by each disinfectant. which of the following is a variable in this experiment? a. the type of disinfectant used b. the type of bacteria used c. the petri dish used d. the length of time that the disinfectant is used
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Physics, 21.06.2019 13:00
Explain the doppler effect in terms of frequency, wavelength, and speed.
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Physics, 22.06.2019 18:00
Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?
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Physics, 22.06.2019 18:00
A4.0-cm tall light bulb is placed a distance of 32.0 cm from a concave mirror having a focal length of 16.0 cm. determine the image distance
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Physics, 22.06.2019 19:20
Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.
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Arthur is testing how well various types of disinfectants can kill e. coli bacteria. he starts with...
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