Sam is comparing the half-life of two isotopes of uranium. The half-life of Uranium-238 is 4.5×10

Question

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?

2.81+10
4

4×10
2.81

2.81×10
4

2.81×10
−4

Answer 1

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

Therefore, the correct answer is:

2.81×10⁴