• question_answer 17) A photograph of a bacteria enlarged 50,000 times, attains a length of 5 cm. What is the actual length of the bacteria? A)  $2\times {{10}^{-4}}cm$              B)  ${{10}^{3}}cm$   C)  ${{10}^{-4}}cm$  D)         ${{10}^{4}}\text{ }cm$

Let actual length of bacteria be $x$ cm.  Enlargement of the photograph 50,000 times 1 time Length of bacteria 5 cm X
More the enlargement of photograph, more would be its length. So, it is a case of direct proportion. Hence, $\frac{50000}{5}=\frac{1}{x}\Rightarrow x=\frac{5}{50000}={{10}^{-4}}cm$.