Use Scientific Notation Quick Check

Question

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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 times 10 superscript 4 baseline

2.81+104
2.81 plus 10 superscript 4 baseline

4×102.81
4 times 10 superscript 2.81 baseline

2.81×10−4

Answer 1

The number displayed by Sam's calculator, 2.81E4, is written in scientific notation. In scientific notation, "E" denotes "times 10 to the power of," so 2.81E4 is equivalent to \(2.81 \times 10^{4}\).

Therefore, the correct response is:

2.81×10^4