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The characteristic X-rays for the lines of K_(a) series in element X and Y are 9.87 Å and 14.6 Å respectively .If Moseley's equation sqrt(v) = 4.9 xx 10^(7) (Z - 0.75) is followed: The atomic number of X is

The characteristic X-rays for the lines of K_(a) series in element X and Y are 9.87 Å and 14.6 Å respectively .If Moseley's equation sqrt(v) = 4.9 xx 10^(7) (Z - 0.75) is followed: The atomic number of Y is

Evaluate the following: (i) sqrt(-81) (ii) (sqrt(-2))^(6) (iii) sqrt(-25)xxsqrt(-49) (iv) (2)/(3)xxsqrt((-9)/(16)) (v) sqrt((-49)/(25))xxsqrt((-1)/(9))

" Find the molality of "49%" (w/v) "H_(2)SO_(4)" solution having density "1.49gm/ml

Find the molality of 49% (W/V) H_(2)SO_(4) solution having density 1.49gm/ml

The power delivered in the plate circuit of a diode is 1.0 W when the plate voltage is 36 V . Find the power delivered if the plate voltage is increased to 49 V . Assume Langmuir-Child equation to hold .

A particle moving along a straight line has a velocity v m s^(-1) , when it cleared a distance of x m. These two are connected by the relation v = sqrt (49 + x) . When its velocity is 1 m s^(-1) , its acceleration is

Write each of the following rational number in standard form: (i) frac(35)(49) (ii) frac(8)(-36) (iii) frac(-27)(45) (iv) frac(-14)(-49) (v) frac(91)(-78) (vi) frac(-68)(119) (vii) frac(-87)(116) (viii) frac(299)(-161)

An electron passing through a potential difference of 4.9 V collides with a mercury atom and transfers it to the first excited state. What is the wavelength of a photon corresponding to the transition of the mercury atom to its normal state?

Emf of a cell corresponding to the reaction:- Zn(s) +2H^(+) (aq) rarr Zn^(2+)(aq) [0.1M] +H_(2)(g) [1.0atm] is 0.49V at 25^(@)C, E_(Zn^(2+)//Zn)^(@) = - 0.76 V . The pH of solution in cathode chamber is.