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PHY101 Assignment # 04 Solution & Discussion Due Date:17-01-2012

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Question # 1
Light strikes water in a placid lake at an angle of 30° from the horizontal. Is
it correct to say this, that its incident angle is 30°? If yes prove it, if not
explain it.
Ans:
No its not correct. the incidence angle is the angle between light and normal.
normal is always perpendicular to the surface .

Question # 2
Most computers today contain a CD-ROM drive and many contain a DVD
drive. A CD or DVD can hold a great quantity of information. The
drive relies on important phenomena of Physics called interference to
“read” the disc. Discuss the Physics of interference in CD and DVD. Also
explain why DVD can store more data than CD.
Ans:
I believe that DVDs use red lasers and CDs use infrared ones, and as red
light has a shorter wavelength that means it can distinguish smaller pits in
the surface and so more bits can be fitted in the same space.

Question # 3
Fluorescent light often use an inductor, called a ballast, to limit the current
through tubes or energy saver. Why is it better to use an inductor rather
than a resistorfor this purpose, although resistor is even economically
better than an inductor?
Ans:
In inductor there is no loss of energy it store the energy in
magnetic form where is in resistor there is a loss of energy in form of
heat.


Explain it by yuu’r self,
Thanks & best of luck ..

an other idea fr soltn of q3

Attachments:

sumaira shabbir gud keep it up 

thnxxx sir

Question 3

Fluorescent light often use an inductor, called a ballast, to limit the current through tubes or energy saver. Why is it better to use an inductor rather than a resistor for this purpose, although resistor is even economically better than an inductor? 
Ans 
The resistor and inductor both may be used to limit a.c current in tubes but in resistor the power less is maximum while in inductor power loss is negligible the impedance of inductor is
[IMG]file:///C:/DOCUME~1/ADMINI~1/LOCALS~1/Temp/msohtmlclip1/01/clip_image002.gif[/IMG] 
Where r is small resistance of inductor the average power dissipated in bullet is given by

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