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 Pankti Kansara's messages in the community 1 2 3 4 5 6 7 8 9 GO Go to Page...
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 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

fringe width = La/d

so no. of fringes per metre = d/aL

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

the first step....

log x a = 1 / log a x

log ax a = 1 / log a ax

= 1 / ( log ax / log a)

= 1 / [ (log a + log x) / log a ]

= 1 / [ 1 + (log x / log a) ]

=  1 / ( 1 + log a x )

similary log a^2/x a = 1 / ( 2 + log a x )

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

( log x * log 3 * log 3 ) / ( log 3 * log x/3 * log x/81 ) = 0

for the numerator to be 0, log x should be 0.....implies x = 1

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

u can derive them from the basic formulae...

but as u'll keep practising u'll eventually learn them by heart...so dont worry bout it!

jus keep practising....

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

wers d figure???

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

which chp dear???...

 Discussion Forums -> This Post 5 points    (1    in 1 votes )   [?]

by applying Heisenberg's uncertainity principle

if we assume the electron to be inside the nucleus and calculate its velocity inside the nucleus it comes out to b more than the vel of light which is not possible. so it cannot exist inside the nucleus

we calc the vel of electron in the foll way:

as e- is assumed inside the nucleus delta x = 10-15m

the product delta x. delta v = h/(4. pi. m)

therefore delta v = h/(4. pi. m. delta x)

subs the values of h, pi, m and delta x to get the ans as 5.8 x 1010m/s
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

can u pls give d diagram...

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

(x+5)- (x-5)2 = 9

(x+5+x-5)(x+5-x+5) = 9    .........using a2-b2 = (a+b)(a-b)

(2x)(10) = 9

20x=9

x=9/20

 Discussion Forums -> This Post 2 points    (0    in 1 votes )   [?]

if v have 2 chk d continuity at x=1 then f(x) is defined as 4x+1

is not considered at all.....so it makes no difference wat value  takes.....f(x) will always be continuous at x=1.

 Discussion Forums -> This Post 5 points    (1    in 1 votes )   [?]

obviously there will be a change in velocity.....its direction changes on every instant n so does d velocity

 Discussion Forums -> This Post 5 points    (1    in 1 votes )   [?]

v've been told dat d 1st one is correct n its explanation has been given in resnick halliday krane...

if u want d expln then temme......i'll post it

 Discussion Forums -> This Post 2 points    (0    in 1 votes )   [?]

ders no fixed value of t

the meaning of the notation g(x) = max f(x) ;

is that g(x) attains the maximum value of f(t) wer t is the local maxima of f(x) and it should lie between x-1 and x+1.....n the range of x is already given. So u can find the value of g(x)

hope its clear....if not then u can nudge me

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

pls post the full ques dear.......

neways i read ur 1st half of d ques from d previous msg....d ans 2 ur ques is

12C3 - 4C3 - 5C3 - 1 = 205

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

point of infection is where f "(x) i.e. the second derivative of the function is either 0 or does not exist......

it can be defined as the point where the graph of f'(x) changes from increasing to decreasing or vice-versa......

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

no.......coz the very first condition for differentiability is dat it shud b a continuous function

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

yeah.....even in a ring i think the c.o.m. lies at the centre of the circle dats outside the ring

 Discussion Forums -> This Post 2 points    (0    in 1 votes )   [?]

vcom = (m1v1 + m2v2) / m1 + m2

= (4+40) / 6 = 44/6 m/s

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

f(x) = x2 - x sin x

for f(x) to be an increasing function f'(x)  0

f'(x) = 2x - x cos x - sin x

T.P.T: f'(x)  0

f"(x) = 2 + x sin x - 2 cos x

since

f''(x) > 0 (x sin x is always +ve in 0 to pi/2 and 2 - 2cos x is also >=0)

thus f'(x) is an increasing function

for an increasing function, if x>0 then  g(x) > g(0)

but here f'(0) = 0

so f'(x) > f'(0) i.e. 0.........f'(x) >0

since f'(x) > 0, f(x) is an increasing function

hence proved

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

ya dats d rite ans......

( - infinity , - sqrt 2] U [ sqrt 2 , 2 ) U ( 3 , infinity )

sry for d wrong ans b4.....actually i had made a mistk in considering s step function

bt dis is  d rite  ans now....

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