Converting to scientific notation: Express the number 14.8 in standard scientific notation (mantissa between 1 and 10).
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A1.48 × 10^−1
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B1.48 × 10^0
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C1.48 × 10^1
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D1.48 × 10^2
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E14.8 × 10^0
Answer
Correct Answer: 1.48 × 10^1
Explanation
Introduction / Context:Scientific notation expresses numbers as a product of a mantissa (between 1 and 10) and a power of ten. This format simplifies calculations, comparisons, and significant-figure control—especially in electronics where values span many orders of magnitude.
Given Data / Assumptions:
- Original number: 14.8.
- Target format: a × 10^n with 1 ≤ a < 10.
- No change to the value—only its representation.
Concept / Approach:
To convert, reposition the decimal point so the mantissa lies between 1 and 10, then adjust the exponent to preserve the numeric value. Moving the decimal one place to the left increases the power of ten by +1; moving to the right decreases it by −1.
Step-by-Step Solution:
Start: 14.8.Shift decimal one place left → 1.48 (mantissa within [1, 10)).Compensate by multiplying by 10^1 to keep value: 1.48 × 10^1.Check: 1.48 × 10 = 14.8, so equality holds.Verification / Alternative check:
Write 14.8 as 148 × 10^−1 or 0.148 × 10^2; normalizing to mantissa 1–10 always returns 1.48 × 10^1. This is the unique standard scientific-notation form for 14.8.
Why Other Options Are Wrong:
- 1.48 × 10^−1 and 1.48 × 10^0 do not equal 14.8.
- 1.48 × 10^2 equals 148, not 14.8.
- 14.8 × 10^0 equals 14.8 but mantissa is not normalized; standard scientific notation requires 1 ≤ mantissa < 10.
Common Pitfalls:
- Leaving mantissas like 14.8 instead of normalizing.
- Forgetting to adjust the exponent when moving the decimal point.
Final Answer:
1.48 × 10^1