Answer:
1. (F) Increasing the frequency variable reduces the time required.
2. (I) Intensity variable can be related the the energy expended.
3.(T) Time variable would affect the speed.
Explanation:
1. (F) increasing the frequency variable implies that the distance would be covered in lesser time. As a wave of 250Hz cover more distance than that of 200Hz.
2. (I) Intensity variable. An increase in this variable implies that more energy is expended.
3.(T) Time variable can either give the required out come or not. As increasing the time would mean that the speed has reduced, while decreasing the time means the distance would be covered quickly. If the required speed is 20m/s, then increasing it to 30m/s imples that lesser time would be recorded. If the reverse is the case, then more time would be recorded. time = distance/speed
1. reduces the time required.
2.energy expended.
3.affect the speed.
Frequency, time period and intensity are quantitative dimensions which describe the amount of physical activity taking place during a given time.
1. (F) frequency variable - Frequency refers to the number of waves that pass a fixed point in unit time.
i.e. [tex]F =\frac{1}{T}[/tex]
When frequency is increased then distance would be covered in lesser time.
For example, a wave of 550Hz cover more distance than that of 500Hz.
2. (I) Intensity variable- The quantity of energy the wave conveys per unit time across a surface of unit area.
i.e. [tex]I = \frac{P}{4\pi r^{2} }[/tex]
When Intensity increases it implies that more energy is expended.
3.(T) Time variable -It is define as the ratio of distance and time.
i.e. [tex]time = \frac{distance}{speed}[/tex]
When time variable is increased than the quantity of energy the wave conveys per unit time across a surface of unit area, speed is reduced.
When time variable is decreased the distance would be covered quickly.
For example : If the speed of car is 80m/s, then by increasing the speed to 100m/s shows that lesser time would be required.
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