13 × 10-7 Km is the standard form of which of the followinga)0.0...
13×10^ -7
=> 13÷10^ 7
=>0.00,00,013 km (option B)
This is because, negative exponent means that reciprocal of the base to make exponents positive. In this case, 10^ -7 is equal to 1/10^7, and 13×1 is 13, hence, 13×10^-7 is 13×(1/10^7). That is 13×(1/1,00,00,000) => 13/1,00,00,000 => 0.00,00,013 km. Hence, option b is correct.
13 × 10-7 Km is the standard form of which of the followinga)0.0...
The number 13 is a prime number. It is only divisible by 1 and itself.