Practice free Waves (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The total time taken from a point on the object to the corresponding point on the image for reflection or refraction by mirrors and lenses is:
The text concludes, 'From the above discussion it follows that the total time taken from a point on the object to the corresponding point on the image is the same measured along any ray.'
What is the physical principle that explains why a rigid boundary causes a phase change of $\pi$ in the reflected wave, based on Newton's Third Law?
The text explains, 'As the pulse arrives at the wall, it exerts a force on the wall. By Newton’s Third Law, the wall exerts an equal and opposite force on the string generating a reflected pulse that differs by a phase of $\pi$.'
The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is:
Open pipe: $f = v/(2L)$. Closed pipe: $f = v/(4L)$. Ratio $= 2:1$.
A pipe open at both ends has a fundamental frequency $f$ in air. The pipe is now dipped vertically in a water drum to half of its length. The fundamental frequency of the air column is now equal to:
Open pipe: $f = \dfrac{v}{2L}$. Half-submerged becomes a closed pipe of length $L/2$: $f' = \dfrac{v}{4(L/2)} = \dfrac{v}{2L} = f$.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.