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Question

To express the speed of the supersonic jet, which is 130000 m/s, in the standard form, we write it as 1.3×10a m/s. The value of a is _______ .


A
5
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B
7
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C
6
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D
4
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Solution

The correct option is A 5
Given, Speed of the jet = 130000 m/s
We know, any number can be expressed as a decimal number between 1.0 and 10.0 including 1.0, and it being multiplied by a power of 10. Such form of a number is called its standard form.
130000=13×10000 =13×104 =1.3×105
Therefore the standard form of 130000 is 1.3×105.
Hence, a=5.

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