Please select a subject first
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What is the focal length (f) of a mirror?
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______ is a general term for the distinguishable characteristic of a wave.
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What is a star? What is its composition and how was it formed?
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How is the pole star distinguished from other stars? Explain.
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We can see nearly ______ stars with the naked eye in the dark night.
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The brightness of stars depends on their ______ and ______ from the earth.
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The temperature of the star is determined by ______.
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Stars also appear to be in different colors depending on their composition of Gases.
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Briefly explain
- brightness
- color of the star.
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How are impure substances classified?
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| Group in the modern periodic table | Families |
| 1 | ______ |
| ______ | Transition metals |
| ______ | Boron family |
| 15 | ______ |
| 17 | ______ |
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The hydrogen atom does not have ______.
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Which subatomic particles have no charge?
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α, β, γ rays are during the ratio active decay ______ of an atom.
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Beryllium + α – rays → Carbon + ______.
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The stability of the nucleus is determined by the Neutron – Proton ratio.
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