Write the answers to the following questions:
1. Justify or criticize "Although the isobars have same mass numbers their
masses are not exactly same".
2. Why are the weights in a weight box kept in a 5.2:2:1 ratio?
3. Why is an aeroplane unable to fly in vacuum?
4. From his experiments, how did Rutherford conclude that most of the space
inside an atom is empty?
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