Which of the following are true regarding ionosphere 1 It is the uppermost layer of atmosphere...........

Geography World climates

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Which of the following are true regarding ionosphere?

1. It is the uppermost layer of atmosphere

2. The molecules and atoms of nitrogen and oxygen in this layer absorb a part of solar radiation and become ionized

3. This layer is responsible for reflecting back the radio waves transmitted from the earth.

1 and 2 Only

1 and 3 Only

2 and 3 Only

1, 2 and 3

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Explanation:

1. First statement is incorrect as exosphere is the uppermost layer of the atmosphere.

2. The ionosphere is defined as the layer of the Earth's atmosphere that is ionized by solar and cosmic radiation. It lies 75-1000 km (46-621 miles) above the Earth. Because of the high energy from the Sun and from cosmic rays, the atoms in this area have been stripped of one or more of their electrons, or “ionized,” and are therefore positively charged.

3. Third statement is also correct.