`2l\ 5m l= dotl`

2l\ 5m l= ....... l

If the d.c's (l,m,n) of two lines are connected by the relations 7l^(2) + 5m^(2) - 3n^(2) = 0 , l - 5m + 3n = 0 then the d.c's of the two lines are

Statement (R): 1// a-b= x^b-a .Statement (A): l xx l xx l __m times// m xx m xx m xx __l times= l^m// m^l.Statement (J): Prime factorisation of 450 is 2x3^2x5^2 .

Subtract : 3l(l - 4m + 5n) from 4l(10n - 3m + 2l)

If the direction ratios l, m ,n of the lines satisfy l-5m+3n=0, 7l^(2)+5m^(2)-3n^(2)=0 then the angle between the lines is

Subtract: 3l (l – 4 m + 5 n) from 4l ( 10 n – 3 m + 2 l )

Explain giving reasons which of the following sets of quantum number are not possible (a ) n=0, l =0 m_(l) = 0, m_(s ) =+ (1)/(2) ( b) n=1 , l = 0 m_(l) = 0, m_(s ) = - (1)/(2) ( c) n=1 , l = 1, m_(l ) = 0, m_(s ) = + (1)/(2) (d ) n= 2, l = 1, m_(l ) = 0, m_(s ) = (1) /(2) ( e) n=3, l = 3, m_(l) = 3, m_(s ) = + (1)/(2) (f ) n=3, l = 1, m_(l) = 0, m_(s) l = + (1)/(2)

Explain giving reasons, which of the following sets of quantum numbers are not possible. a) n = 0, l = 0 m_l =0 , m_s = + 1//2 b) n = 1, l = 0, m_l = 0 , m_s = +1//2 c) n = 1, l = 1 m_l = 0 , m_s = + 1//2 d) n = 2, l = 3 m_l = 0 , m_s = -1//2 e) n = 3, l=3 m_l = -3, m_s = + 1//2 f) n = 3, l = 1 m_l = 0 , m_s = + 1//2