1(a) Define the following terms stating their S.I units:
(i) Luminous intensity (2 Marks)
(ii) Luminous flux (2 Marks)
(b) A small source of light has a mean spherical intensity of 300cd. One quarter of the total
flux emitted from the source fall at right angles onto a surface measuring 4m x 0.8m.
Calculate:
(i) The total luminous flux given out by the source. (2 Marks)
(ii) The illuminance produced on the surface (2 Marks)
(c) State the inverse square law of illumination (2 Marks)
(d) Differentiate between disability glare and discomfort glare. (4 Marks)
(15 MARKS)
2(a) Define the following terms in relation to sound:
(i) Wavelength (1 Mark)
(ii) Frequency (1 Mark)
3
(iii)Velocity (1 Mark)
(iv) Pitch (1 Mark)
(b) State Sabine?s method of calculating reverberation times in rooms. (2 Marks)
(c) Define the term „decibel? (1 Mark)
(d) What do you understand by the term „threshhold of pain? (2 Marks)
(e) A sound has a pressure of 4.5 x 10-2 pa when measured under certain conditions.
Calculate the sound pressure level of the sound. Threshold hearing pressure
= 20 x 106 pa (4 Marks)
(f) Name any 2 absorbers of sound. (2 Marks
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