How Does X-Ray Ionisation Impact Millikan's Oil Drop Experiment?

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SUMMARY

X-ray ionisation plays a crucial role in Millikan's oil drop experiment by charging the oil droplets, enabling the measurement of their charge. The X-ray tube is essential for this process, as it ionises the oil, allowing for the creation of charge on the droplets. However, excessive ionisation can lead to errors in calculations due to the upward attraction of the charged oil drops. Researchers can mitigate this by turning off the X-ray tube before final measurements to prevent overcharging.

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curious bishal
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What is the use of X-ray in Millikan's oil drop experiment? It ionises the oil but what does the ionisation help in? If it creates charge, then the oil's charge keep on increasing it creates error in calculation as the oil drop is attracted upward after sufficient amount of charge.
 
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The X-ray tube was used to charge the oil drops.
There is a limit to how much charge can be removed from the drop by x-rays and, anyway you can always turn the tube off before doing the experiment.
 
Without something to charge the drops, there would be no experiment.
 

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