One-half of 1.2 × 10³0} is

Correct Answer is : 6.0×10296.0 × 10²9}6.0×1029

One-half of 1.2 × 10³0} is

Correct Answer is : 6.0×10296.0 × 10²9}6.0×1029

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CTET Paper II (Mathematics and Science) July 2013 Solved Paper

Question : 59 of 150

Marks: +1, -0

One-half of 1.2 × 10^{30} is

$6.0 × 10^{30}$
$6.0 × 10^{29}$
$0.6 × 5^{30}$
$1.2 × 10^{15}$

Validate

Solution:

Concept:

Half of a number in scientific notation is obtained by dividing the coefficient by 2 while keeping the exponent unchanged, then adjusting to proper scientific form.

Explanation:

Compute half of

1.2 \times 10^{30}

\frac{1.2 \times 10^{30}}{2}

Divide the coefficient

1.2

2

to get

0.6

. The exponent stays

30

This gives

0.6 \times 10^{30}

. Convert to proper scientific notation by moving the decimal one place right and decreasing the exponent by 1:

6.0 \times 10^{29}

Answer:

Option B:

6.0 \times 10^{29}

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