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ECAT and MCAT Preparation: Post your doubts here!

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When waves of two frequencies combine to make one
wave, this phenomenon is called
A. diffraction.
B. interference.
C. beats.
D. difference tones.
 
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When waves of two frequencies combine to make one
wave, this phenomenon is called
A. diffraction.
B. interference.
C. beats.
D. difference tones.
beats C

it is a small topic in fsc physics book.

when two waves of slight phase diff. (diff. freq.) interfare they form waves of constructive and destructive interferance.. known as beats.

sounds of changing frequencies whch a person can hear, while standing at a fixed point are called beats.

the diff. between two varing frequecies leadind to the formation of a beat is the max. freq. of a beat that a person can hear; clearly.
 
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Our sun releases energy by nuclear fusion reactions. What actually happens?
(A) Hydrogen is converted to helium
(B) Helium is converted to hydrogen
(C) Two nuclei change into one nucleus
(D) One nucleus splits into two nuclei
well this onwe will be C ryt....cos in option A hydrogen nuclei is not specified
 
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Our sun releases energy by nuclear fusion reactions. What actually happens?
(A) Hydrogen is converted to helium
(B) Helium is converted to hydrogen
(C) Two nuclei change into one nucleus
(D) One nucleus splits into two nuclei
well this onwe will be C ryt....cos in option A hydrogen nuclei is not specified


YES THIS ONE WIL BE C NO DOUBT


AND NO i AM IN karachi BUT APPLIED THERE... WBU????
 
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Cube roots of unity

x^3 = 1

x^3 -1 =0

(x-1)(x^2 +x+1) = 0

can anyone tell me how did the term in the 3rd step came?
 
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Cube roots of unity

x^3 = 1

x^3 -1 =0

(x-1)(x^2 +x+1) = 0

can anyone tell me how did the term in the 3rd step came?

term in the third step has came when u expand x^3 - 1^3 according 2 formula
a^3 - b^3 = (a - b)(a^2 +ab + b^2)


either

x-1 = 0
x=1

or


x^2 +x +1 =0

( Applying quadratic formula)

x = (1+Root(3))/2
it is called Omega

or

x = ((1-Root (3))/2
it is called omega square

Hence cube root of unity(1) are x = { 1, w , w^2} w = omega
 
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me and alpha bravo charlie any one else???

I am, but i'm gonna be taking the test without studying a single word :p Because i spent a week at Pieas 'cause of Nptc training camp thingy, and well as a university pieas is pretty dull. I'm just taking the test 'cause my parents want me to :p
 
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I am, but i'm gonna be taking the test without studying a single word :p Because i spent a week at Pieas 'cause of Nptc training camp thingy, and well as a university pieas is pretty dull. I'm just taking the test 'cause my parents want me to :p
hahaha same is the reason behind my appearance in the test bro.
 
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IIEE is better from this point of view,, only 3rd Institution in south Asia which graduates u in Industrial and Electronic engineering,, but quota for Karachi is about 8 or 9 seats.. :p if anyone has domicile from other than Karachi , he/She should surely apply
 
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