Physics SSC - I (Class 9) - Numerical Problem No. 1, Unit-1: Physical Quantities and Measurements (National Book Foundation 2022 as Federal Text Book, Islamabad)

Write the following numbers in scientific notations 

a. 1234 m                           b. 0.000023 s 
c. 469.3 ｘ10⁸ m                  d. 0.00985 ｘ10⁷ s

Ans {(a) 1.234 ｘ 10³ m             (b)  2.3 ｘ 10⁻⁵  s 
       (c) 4.693 ｘ10¹⁰ m              (d) 9.85 ｘ10⁴ s  }

Solution:  

(a) 1234 m   

⇒  1.234 ｘ 10³ m  --------------Ans

(b) 0.000023 s

⇒  2.3 ｘ 10⁻⁵  s ---------------Ans.

(c) 469.3 x 10⁸ m

⇒  4.693 ｘ10² ｘ10⁸ m

⇒  4.693 ｘ 10²⁺⁸ m 

⇒  4.693 ｘ10¹⁰ m  ------------Ans.  

(d) 0.00985 ｘ10⁷ s
  

⇒  9.85 ｘ10⁻³ ｘ10⁷ s

⇒  9.85 ｘ 10⁻³⁺⁷ s

⇒  9.85 ｘ10⁴ s -----------Ans.

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