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Question
Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5×109
years. The half-life of Uranium-233 is 1.6×105
years. He computed how much greater the half-life of Uranium-238 is than that of Uranium-233, and his calculator displayed the number 2.81E4. What is this number in scientific notation?(1 point)
Responses

2.81+104
2.81 plus 10 superscript 4 baseline

2.81×10−4
2.81 times 10 superscript negative 4 baseline

2.81×104
2.81 times 10 superscript 4 baseline

4×102.81
4 times 10 superscript 2.81 baseline
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Answer 1

The number displayed by Sam's calculator, 2.81E4, is in scientific notation and represents \(2.81 \times 10^4\).

Therefore, the correct response is:

2.81×10^4
(2.81 times 10 superscript 4 baseline)