Answer Posted / sanju

In cold regions, the air touching the surface of the earth
is extremely cold and hence it is denser than the air which
is higher than the surface. When a ray from a boat travels
more and more away from the normal. Finally, the angle of
incidence becomes grater than the critical angle and total
internal reflection takes place. Now, on traveling downwards
the rays pass from rarer into denser layers and are bent
more and more towards the normal. At last they enter the eye
of the observer. To him it appears to come from some other
point. Similarly, the image of every point of the boat is
formed high up in the air and whole of the boat appears
hanging upside down in the air.

Explain refraction?

505

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What do you mean by diffraction and what is/are the proper condition/conditions for it?

633

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What cycle most directly describes the working cycle of a heat engine operating as an ideal engine of maximum thermal efficiency?

508

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What is the difference between diffraction and interference?

480

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When a person whirls a rock on the end of a string and maintains it in uniform circular motion, the force exerted on the rock is most accurately referred to as?

588

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Explain the difference between free electron theory and band theory of solids?

496

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Shall i get Section engineer S & T question paper? (Railway recruitment board)

2117

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State Laws Of Conservation Of Energy?

506

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Which waves are used in sonography?

556

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The lowest frequency that determines the pitch of a musical note is most commonly called the?

494

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What is the dramatic increase in amplitude called when the frequency of forced vibrations on a body matches the bodys natural vibration frequency?

545

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What is speed of sound through water?

548

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How many neutrons are present in a single deuterium nucleus?

486

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Explain what are wave fronts?

508

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By primarily using what simple machine did galileo come to the conclusion on the existence of friction?

510

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