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(d) Two people are speaking at the same time, with the voice of one of them slightly higher than the other. What property of sound can be used to identify these individuals? Explain briefly. (e) A man builds a house with hollow blocks. What is the effect of the hollow blocks with respect to sound? Give two other examples of techniques that he could use to achieve the same effect. (f) Why do oceans store heat during the summer period and slowly release it during the winter?

(d) Two people are speaking at the same time, with the voice of one of them slightly higher than the other. What property of sound can be used to identify these individuals? Explain briefly. (e) A man builds a house with hollow blocks. What is the effect of the hollow blocks with respect to sound? Give two other examples of techniques that he could use to achieve the same effect. (f) Why do oceans store heat during the summer period and slowly release it during the winter?

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PART D E F 

1. (a) What is the electromagnetic wave being used in most TV remotes and what is the nature of their wavelengths? (b) Briefly explain what happens when light hits a rough surface and disperses in different directions. (c) Briefly explain what happens if an object is placed between the centre of curvature(c) and the focal point (F) of a concave mirror as shown in Figure Ql.(c) below: Object Figure Q1.(c) (d) Two people are speaking at the same time, with the voice of one of them slightly higher than the other. What property of sound can be used to identify these individuals? Explain briefly. (e) A man builds a house with hollow blocks. What is the effect of the hollow blocks with respect to sound? Give two other examples of techniques that he could use to achieve the same effect. (f) Why do oceans store heat during the summer period and slowly release it during the winter?
Transcribed Image Text:1. (a) What is the electromagnetic wave being used in most TV remotes and what is the nature of their wavelengths? (b) Briefly explain what happens when light hits a rough surface and disperses in different directions. (c) Briefly explain what happens if an object is placed between the centre of curvature(c) and the focal point (F) of a concave mirror as shown in Figure Ql.(c) below: Object Figure Q1.(c) (d) Two people are speaking at the same time, with the voice of one of them slightly higher than the other. What property of sound can be used to identify these individuals? Explain briefly. (e) A man builds a house with hollow blocks. What is the effect of the hollow blocks with respect to sound? Give two other examples of techniques that he could use to achieve the same effect. (f) Why do oceans store heat during the summer period and slowly release it during the winter?
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