Assertion `(A): beta-` particles have greater penetrating power than `alpha-` rays but less than `gamma-`rays. Reason `(R) : beta-` particles are ligh

Correct option is D) gold foil

given-: a+b=-1............ eqn ¹ ab=-4. ............. eqn ² on squaring eqn ¹ a²+b²+2ab=1 a²+b²=9 on squaring eqn ² a²b²=16 hence the eqn is x²+9x+16=0 ♥ 

B) Both A and R are correct, R is not the correct explanation of A

A) A is true and R is false

Correct option is A) more

(iv) Assertion is wrong statement but reason is correct statement. 

दिया है - `" "a cos x + b sin x = c" ...(i)"` `rArr" "a cos x = c- b sin x` `rArr" "a^(2)cos^(2)x=(c-bsinx)^(2)` `rArr" "a^(2)(1-sin^(2)x)=c^(2)+b^(2)sin^(2)x-2bc sin x` `rArr"...

Correct Answer - a R is the correct explanation of A .

(ii) Both A and R are correct but R is not the correct explanation of A.

Correct Answer - A::C::D Clearly `R(alpha,beta)` is centroid of `DeltaABC`s `:.R(alpha,beta)=((3+1+2)/3,(9+2+3)/3)=(2,14/3)` `impliesalpha=2` and `beta=14/3` Hence `2alpha+3beta=18`