Make the correct for each of the following :
With reference to the fig, the refractive index of the glass block is
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
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Briefly, describe an experiment to show that a prism itself produces no colour.
[4] Refraction of Light at Plane Surfaces
Chapter: [4] Refraction of Light at Plane Surfaces
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What are free vibrations?
[7] Sound
Chapter: [7] Sound
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What is meant by the natural frequency of vibration of a body? Name two factors on which it depends?
[7] Sound
Chapter: [7] Sound
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State any two ways of increasing the frequency of vibration of a stretched string.
[7] Sound
Chapter: [7] Sound
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Name the three elementary particles present in an atom. Locate their positions.
[12] Radioactivity
Chapter: [12] Radioactivity
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[12] Radioactivity
Chapter: [12] Radioactivity
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What do you mean by Atomic number
[12] Radioactivity
Chapter: [12] Radioactivity
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What do you mean by Mass number.
[12] Radioactivity
Chapter: [12] Radioactivity
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What do you mean by Atomic mass
[12] Radioactivity
Chapter: [12] Radioactivity
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[12] Radioactivity
Chapter: [12] Radioactivity
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Do isotopes have same chemical or physical properties?
[12] Radioactivity
Chapter: [12] Radioactivity
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[12] Radioactivity
Chapter: [12] Radioactivity
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State two similarities and two dissimilarities between the γ-rays and X-rays.
[12] Radioactivity
Chapter: [12] Radioactivity
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State the penetrating range of α, β and γ radiations.
[12] Radioactivity
Chapter: [12] Radioactivity
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Give the relative ionizing power of α, β and γ radiations.
[12] Radioactivity
Chapter: [12] Radioactivity
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What happens to the atomic number of element when (i) An α -particle, (ii) A β -particle 1 and (iii) γ-radiation is emitted?
[12] Radioactivity
Chapter: [12] Radioactivity
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What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
[12] Radioactivity
Chapter: [12] Radioactivity
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A radioactive source emits three types of radiations. Name them.
(i) Name the radiations which are charged.
(ii) Name the radiations which are most penetrating.
(iii) Name the radiations which travel with the speed of light.
(iv) Name the radiations which have the largest mass.
[12] Radioactivity
Chapter: [12] Radioactivity
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'Radioactivity is a nuclear phenomenon'. Comment on this statement.
[12] Radioactivity
Chapter: [12] Radioactivity
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