Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5×10^9 years. The half-life of Uranium-233 is 1.6×10^5 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?

Question

4×102.81
4 times 10 superscript 2.81 baseline

2.81×104
2.81 times 10 superscript 4 baseline

2.81+104
2.81 plus 10 superscript 4 baseline

2.81×10−4

Answer 1

The number 2.81E4 is equivalent to \(2.81 \times 10^4\) in scientific notation. So, the correct option is:

2.81×10^4