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both are concave lens

for smaller wavelength how you can divide by4

since the formula of bohr radius = 0.529n²/z

so, r ∞ n²

also, magnetic field ∞ 1/r=> magnetic field ∞ 1/n²

so when n changes from 2 to 1magnetic field changes from 1/2²= 1/4 to 1

so , it increases 4times..

option B

But ans is d

Here i is not also constant value..... So itink i must e resolve. In n relationship

I don't think.. answer should be d..how can it increase by 32times..

Use it

Thanks anjum

Here olive oil spread as a film, supposing it is 1 molecule thick on water surface, then the thickness of the film will give the estimate of diameter of molecule

So, we have

d = Volume of oil drop ÷ Area of film

d = 4/3 π (0.03)³ ÷ π (12)²

d = 4/3 (0.000027) ÷ 144

d = 0.000036 ÷ 144

d = 0.00000025

or d = 2.5 x 10^(-7) cm

Viscosity(μ) has dimension [ML-¹T-¹]Please hit the like button if this helped you

1.) cardboard box

2.) tin foil...

3.) tape or glue

4.) 2 pots (one ceramic and one clear glass).

this first design uses the larger box (the one on the right). just open the box up (flaps and all) and lay it out flat on the floor. then start applying aluminum foil up and down each edge. attach with tape or glue. i just used tape. finally put the last piece of aluminum foil right down the center. then bring it outside and prop it up in a semi-circle (more or less).

a correct answer is (2)

|A×B| = √3(A•B)

=> ABsin∅ = √3ABcos∅=> sin∅/cos∅ = √3 => tan∅ = √3 .. so, angle between them = 60°

now, |A+B| = √A²+B²+2ABcos60 = √A²+B²+AB

option 1

velocity = Awcoswt

as coswt average value in one complete vibration is zero

so average velocity = 0

2) is the correct answer = zero

2)zero this right answer

The correct option is (d) .

As it takes 4 rounds between maximum and minimum.So, 4×5s= 20 s

Ans:-a)......................

a is the right answer

can you get the answer in cos function?

1/6 hour in 10minutes speed = distance /time60= x/1/6x= 60/610km

In 10 minutes , a car with

v1 = 40 km/h v2 = 60 km /hAverage speed v = (v1 + v2)/2 v = (40 + 60)/2= 50 km /h

Let the total distance be D

now time taken to cover first half =( D/2)/(40)and time taken to cover 2nd half = (D/2)/(60)

total time taken = D/80 +D/120 = 5D/240 = D/48

so, avg. speed = distance/(time) = D/(D/48) = 48km/h

I have done that same thing in shorter time with help of formula 2.v1.v2/v1+v2

Is many definition right or wrong ?

yes, your definition is right.

The answer is Option B

pwolichu

Let time taken by man = time taken by bus =xfor bus:u=0a=2m/s²t=xS=ut+1/2at² =o×x +1/2×2×x² =x²for man :v=10m/st=xS=v×t = 10xdistance travelled by man - distance travelled by bus =25so, 10x-x² =25x²-10x+25=0(x-5)(x-5)=0x=5minimum time = 5sec

hit like if you find it useful

Let time taken by man = time taken by bus =xFor bus:u=0a=2m/s²t=xS=ut+1/2at² =o×x +1/2×2×x² =x²For man :v=10m/st=xS=v×t = 10xdistance travelled by man - distance travelled by bus =25so, 10x-x² =25x²-10x+25=0x²-5x-5x+25=0x(x-5)-5(x-5)=0(x-5)(x-5)=0x=5 time taken = 5sOption d is correct.

non-uniform motion because bus cannot move with constant speed with equal interval of time

v2=u2+2as⇒(9000)2−(1000)2=2×a×4⇒a=107m/s2Now t=v−ua⇒t= 9000−1000107=8×10−4sec

Tofal distance covered = (100+ 100) km = 200 kmTotal time taken = (100/60 + 100/40) = ( 5/3 + 5/2) = 25/6 hours.Average speed = (Total Distance÷ Total Time )= (200 ÷ 25/6 )= (200/1 × 6/25) Km/hr= 48 Km/hr .

48 km/HR is right answer