Answer the following questions : (a) When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the piture on our TV screen. Suggest a possible expanation. (b) As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffractions and interference patterns. What is the justification of this principle ?

Answer the following questions : (a) When a low flying aircraft passes

1.	Answer the following questions : (a) When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the piture on our TV screen. Suggest a possible expanation. (b) As you have learnt in the text, the principle of linear superposition of wave displacement is basic to understanding intensity distributions in diffractions and interference patterns. What is the justification of this principle ?
Answer» Weak rader singals sent by a low fluing aircrrfit with the TV singnals received by the antenna As a result , the Tv signals may get distored Hence when a low fying aircroft passes overhead , we sometimes notice a silght shaking of the picture on our TV screen . (b) the principle o dlinear superpostion of wave displacement is essential toour understanding of intersity disibutions and interference pattens this is because superpostion follows from the linear character of a differential equation that governs wave motion If `y_(1) and y_(2)` are the the solutions of the second order wave equation then an linear combination of `y_(1)and y_(2)` will also be the solution of the wave equation .

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Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength `6000Å`. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will beA. `3500 Å`B. `4200 Å`C. `4700 Å`D. `6000 Å`
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