Question
Which of the following is not an isotope of
oxygen?Solution
Oxygen has three stable isotopes: O-16, O-17, and O-18. O-15 is not a naturally occurring stable isotope and is used in medical imaging as a radioactive tracer.
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A train that is 360 metres long passes a signal post in 18 seconds. How long will it take to pass a bridge that is 240 metres long?
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