Question

1. communication is possible due to the presence of atmosphere
2. oxygen and carbon dioxide are heavier than nitrogen

True or false ​

Answer 1

Answer:

1.False

2.False

Explanation:

1.In this layer of atmosphere, the electrically charged ions are present that reflects the radio waves back to the Earth making the communication process possible on the Earth.

2.Carbon dioxide is present in the atmosphere in 0.04 % only. But Oxygen and Nitrogen are present in 21% and 78% quantities.

Answer 2

Answer:

1. True - because sound cannot travel in vacuum

2. True - according to periodic table oxygen is heavier than nitrogen and CO2 is also heavier than nitrogen as it is molecule

Explanation:

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