For a sine wave depicting simple harmonic motion, the smaller the amplitude of the wave, the smaller the displacement of the pen
2 answers:
The correct answer is
The shorter the period, the shorter the pendulum’s rod
In fact, the period of a simple pendulum is given by:
where T is the period, L is the length of the pendulum's rod, g is the gravitational acceleration. We immediately see from the formula that T and L are proportional: therefore, if the period T is shorter, the length of the pendulum's rod L is shorter as well.
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Answer:
Efficiency
Explanation:
- The amount of mechanical work an engine can do per unit of heat energy it uses is called its efficiency.
- It is also defined as the output divided by the total electrical power consumed.
- In terms of heat, efficiency of engine is given by :
are output heat and input heat respectively.
Hence, the correct option is (d) "efficiency"
Answer: Only 25% of the intensity of a polarized light wave passes through a polarizing filter. Then the angle between the electric field and the axis of the filter will be 60 degrees.
Explanation: To find the answer of the problem given, we have to know about the Malu's law of polarization.
<h3>What is Malu's law of polarization?</h3>- This law states that, when a beam of completely polarized light is passed through an analyzer, then then intensity I of the transmitted light varies directly as the square of the angle
between the transmission direction of the polarizer and the analyzer.
- The expression for this law will be,
- Where, I₀ is the maximum intensity of the transmitted light through the polarizer.
- From the question, it is clear that, the 25% of the intensity of a polarized light wave passes through the filter.
- Thus, the angle between electric field and the axis of the filter is,
Thus, we can conclude that, the angle between the electric field and the axis of the filter will be 60 degrees.
Learn more about the Malus law of polarization here:
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