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)

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

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

2.81+104
2.81 plus 10 superscript 4 baseline

2.81×104
2.81 times 10 superscript 4 baseline

4×102.81

Answer 1

The correct notation for the number 2.81E4 is 2.81×10^4.

Answer 2

2.81×10^4

Answer 3

The number 2.81E4 is already in scientific notation. The "E" represents "times 10 to the power of," and the number after it represents the exponent. In this case, 2.81E4 means 2.81 times 10 to the power of 4, which can be written as 2.81×10^4. Therefore, the correct option is 2.81×10^4.