
a.
To calculate:For the given information develop equation which relates intensity of illumination
a.

Answer to Problem 135RE
The required equation is
Explanation of Solution
Given information:
The Intensity of illumination
Formula used:
For 2 variables say,
Which can be written as:
Where
Similarly the statement
Which can be written as:
Where
Calculation:
AsIntensity of illumination
Recall, For 2 variables say,
Which can be written as:
Where
Hence, this variation can be expressed as follows:
Where
Hence, the required equation is
b.
To calculate:The constant of proportionality
b.

Answer to Problem 135RE
The constant of proportionality
Explanation of Solution
Given information:
The equation found is
Formula used:
For 2 variables say,
Which can be written as:
Where
Similarly the statement
Which can be written as:
Where
Calculation:
AsIntensity of illumination
Form a. the required equation is
It is given that the intensity of illumination
Put these values in
Hence, the constant of proportionality is
c.
To calculate:The intensity of lamp when the distance from the light is
c.

Answer to Problem 135RE
The intensity of lamp when the distance from the light is
Explanation of Solution
Given information:
The equation found is
Formula used:
For 2 variables say,
Which can be written as:
Where
Similarly the statement
Which can be written as:
Where
Calculation:
AsIntensity of illumination
Form a. the required equation is
From b. the constant of proportionality is
Also, it is given distance from the light is
Put
Hence, the intensity of lamp when the distance from the light is
Chapter 1 Solutions
EBK PRECALCULUS: MATHEMATICS FOR CALCUL
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