7th Class Mathematics Exponents and Power

  • question_answer 17) Express the number appearing in the following statements in standard form: (a) The distance between Earth and Moon is \[384,000,000m\] (b) Speed of light in vacuum is \[300,000,000m/s\] (c) Diameter of the Earth is \[1,27,56,000m\]. (d) Diameter of the sun is \[1,400,000,000m\] (e) In a galaxy here are on an average \[100,000,000,000\]stars. (f) The universe is estimated to be about \[12,000,000,000\]years old. (g)The distance of Sun from the centre of the Milky Way Galaxy is estimated to be \[300,000,000,000,000,000,000m\] (h)\[60,230,000,000,000,000,000,000\]molecules are contained in a drop of water weighing \[1.8gm.\] (i) The earth has \[1,353,000,000\]cubic km of sea water. (j) The population of India was about \[1,027,000,000\]in March, 2001.

    Answer:

                    (a) The mean distance between Earth and Moon is \[3.84\times {{10}^{8}}m\].                 (b) Speed of light in vacuum is \[3.0\times {{10}^{8}}m/s.\]                 (c) Diameter of the Earth is \[1.27556\times {{10}^{7}}m\]                 (d)Diameter of the Sun is \[1.4\times {{10}^{9}}m\]                 (e) In galaxy there are on an average \[1.0\times {{10}^{11}}\]stars.                 (f) The universe is estimated to be about \[1.2\times {{10}^{10}}\]years old.                 (g) The distance of Sun from the centre of the Milky Way Galaxy is estimated to be \[3.0\times {{10}^{20}}m\]                 (h) \[6.023\times {{10}^{22}}\]molecules are contained in a drop of water weighing \[1.8gm.\]                 (i) The earth has \[1.353\times {{10}^{9}}\]cubic km of sea water. (j) The population of India was about \[1.027\times {{10}^{9}}\]in March, 2001.

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