`20^circ C`ತಾಪಮಾನದಲ್ಲಿ 1m ಉದ್ದದ ಮ್ಯಾಂಗನೀಸ್‌ ತಂತಿಯ ರೋಧಶೀಲತೆಯು `1.84 **10^(-6) Ω m` ಆಗಿದೆ.ತಂತಿಯ ವ್ಯಾಸವು `3**10^(-4) m` ಆಗಿದೆ, ಈ ತಾಪಮಾನದಲ್ಲಿ ತಂತಿಯ ರೋಧವನ್ನು ಕಂಡುಹಿಡಿಯಿರಿ.

The pH of 2.5xx10^(-1) M HCN solution (K_(a)=4xx10^(-10)) is :

The pH of 0.10 M NH_(3) solution (K_(b)=1.8xx10^(-5)) is :

The electric field due to a proton of charge 1.6 xx 10^(-19)C at a distance 1 A (10^(-10)m) from it is

K_(b) for NH_(4)OH is 1.81xx10^(-5) . The pH of 0.01 M NH_(4)Cl solution at 25^(@)C is :

Two moving coil meters M_1 and M_2 have the following particulars : R_1 = 10 Omega , N_1 = 30 A_1 = 3.6 xx 10^(-3) m^2 , B_1 = 0.25 T R_2 = 14Omega , N_2 = 42 A_2 = 1.8 xx 10^(-3) m^2 , B_2 = 0.50 T (The spring constants are identical for the two meters). Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M_2 and M_1 .

The r.m.s. velocity of molecules of a gas of density 4kg //m^(3) and pressure 1.2 xx 10^(5) N//m^(2) is

See the diagram. Area of each plate is 2.0 m^(2) and d = 2 xx 10^(-3) m . A charge of 8.85 xx 10^(-8) C is given to Q. Then the potential of Q becomes

Calculate the wavelength associated with a proton moving at 1.0xx10^(3)m//s . (Mass of proton =1.67xx10^(-27)kg and h=6.63xx10^(-34) Js)