Intensity of a wave is the. (a) Power per unit area (b) Power per unit volume (c) Power per unit time (d) All of the above
1 answer:
Answer:
Intensity of a wave is Power per unit area.
Explanation:
The intensity of wave is defined as the power per unit area in the direction of motion of wave i.e.
Also, the intensity of a wave is directly proportional to the square of its amplitude. Let a is the amplitude of a wave. So,
The SI unit of power is watt and the SI unit of area is m². So, the SI unit of intensity is W/m². Hence, the correct option is (a) "Intensity of a wave is Power per unit area".
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Answer:
a. 37.75°
b. 6.21 m
Explanation:
a. The horizontal force acting on a pendulum bob is given as:
F = mgsinθ
where m = mass of bob
g = acceleration due to gravity
θ = angle string makes with the vertical or angle of displacement
Making θ subject of formula, we have:
θ =
θ =
θ = 37.75°
The maximum angle of displacement is 37.75°
b. Period of a pendulum is given as:
where L = length of string
Therefore, making L subject of formula:
The string holding the pendulum has to be 6.21 m long.