1. (a) What is the clectromagnetic 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 Q1.(c) below: Object Figure Q1.(c)
1. (a) What is the clectromagnetic 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 Q1.(c) below: Object Figure Q1.(c)
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Part A B C
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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