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Question No1

Which weighs more, a liter of ice or a liter of water?


Liter of water has more weight as compared to ice because it freezes making a given volume of ice lighter than the same amount of water. That is why ice floats in water.


Question No:

Will the current in a light bulb connected to a 220-V source be greater or less than when the same bulb is connected to 110-V source?


 Greater, because current is directly proportional to voltage. I =V / R


Question No

How is the wavelength of light related to its frequency?


c = lambda times f

f = c / lambda

Scroll down to related links and look at "Conversion: frequency f to wavelength lambda and wavelength to frequency"


Question No.

We don't notice the de Broglie wavelength for a pitched baseball. Is this because the wavelength is very large or because it is very small?


We don't notice the de Broglie wavelength for a pitched baseball because the wavelength is very small


Question No                                                                         

Does every magnet necessarily have a north and south pole? Explain


Yes every magnet necessarily has a north and south pole. The poles reaction to each other cause the magnet to attract


Question (Marks: 5)

Consider a lamp hanging from a chain. What is the tension in the chain?


As always, begin with a "free body diagram". Tension T acts upward on the lamp while the force of gravity pulls down with force w, the weight of the lamp. The net force is the vector sum of these two forces. The lamp is not accelerating so the force up must equal the force down. In terms of magnitudes, this means

T = w



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Replies to This Discussion

the following link provide you help in solving of objective of phy101.



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Question no2 i = v/r

Suppose ' r ' is constant i:e 10

So i = 220/10 = 22

    i = 110/10 = 11


                 NOT INVERSELY

Thus current is LESS when voltage is less

        current is MORE when voltage is more


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