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Which of the following phenomena is an example of reflection by a rigid boundary?
The text states, 'The phenomenon of echo is an example of reflection by a rigid boundary.' Echo occurs when sound waves reflect off a hard surface, which acts as a rigid boundary.
When a wave is reflected from a rigid boundary, how does the shape of the reflected wave compare to the incident wave, assuming no absorption of energy?
The text mentions, 'the reflected wave has the same shape as the incident pulse but it suffers a phase change of $\pi$ or $180^\circ$ on reflection' when meeting a rigid boundary.
For an incident travelling wave $y_i(x, t) = a \sin (kx - \omega t)$, what is the expression for the reflected wave at a rigid boundary?
The text states, 'For an incident wave $y_i(x, t) = a \sin (kx - \omega t)$ the reflected wave at a rigid boundary is $y_r(x, t) = -a \sin (kx + \omega t)$'.
What happens to the displacement at a rigid boundary when a wave is reflected?
The text explains regarding rigid boundaries, 'the disturbance must have zero displacement at all times at the boundary. By the principle of superposition, this is possible only if the reflected and incident waves differ by a phase of $\pi$, so that the resultant displacement is zero.'
If a wave is incident on an open boundary, what is the phase change experienced by the reflected wave?
The text highlights, 'no phase change on reflection at an open boundary.' More specifically, it states for an open boundary, '$y_r(x, t) = a \sin (kx - \omega t + 0)$'.
What is the net maximum displacement at an open boundary when a pulse is reflected, assuming no energy dissipation?
For an open boundary, the text states, 'the reflected pulse has the same phase and amplitude (assuming no energy dissipation) as the incident pulse. The net maximum displacement at the boundary is then twice the amplitude of each pulse.'
When a wave is incident obliquely on the boundary between two different elastic media, which of the following laws are obeyed by the incident and refracted waves?
The text states, 'If a wave is incident obliquely on the boundary between two different media the transmitted wave is called the refracted wave. The incident and refracted waves obey Snell’s law of refraction, and the incident and reflected waves obey the usual laws of reflection.' The question specifically asks about incident and refracted waves, which obey Snell's Law.
According to the principle of superposition, if the resultant displacement at a boundary is zero, and a reflection occurs with a phase change of $\pi$, this indicates a:
The text states, 'By the principle of superposition, this is possible only if the reflected and incident waves differ by a phase of $\pi$, so that the resultant displacement is zero. This reasoning is based on boundary condition on a rigid wall.'
Which of the following describes the reflection of a plane wave by a plane surface?
Referring to Fig. 10.6, the text states, 'If we now consider the triangles EAC and BAC we will find that they are congruent and therefore, the angles i and r (as shown in Fig. 10.6) would be equal. This is the law of reflection.'
When light travels from a rarer to a denser medium, what happens to its frequency, wavelength, and speed?
The text states, 'when a wave gets refracted into a denser medium ($v_1 > v_2$) the wavelength and the speed of propagation decrease but the frequency $n (= v/\lambda)$ remains the same.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.