Write (a) `9.87 xx 10^(9), (b) 4.134 xx 10^(-4) and (c) 1.432 xx 10^(-9)` in decimal form.

Charges 5.0 xx 10^(-7) C , -2.5 xx 10^(-7) Cand 1.0 xx 10^(-7) C are held fixed at the three corners A, B, C of equilateral triangle of side 10cm respectively. Find the electric force on the charge at C due to the rest two.

Simplify: (i) (2.75 xx 10^(7))+(1.23 xx 10^(8)) (ii) (1.598 xx 10^(17)) -(4.58 xx 10^(15)) (iii) (1.02 xx 10^(10)) xx (1.20 xx 10^(-3)) (iv) (8.41 xx 10^(4)) divide (4.3 xx 10^(5))

What is 3.9676 xx 10^(-4) written form?

The ionic radii of A^(+) and B^(-) are 0.98 xx 10^(-10) m and 1.81 xx 10^(-10)m . The coordination number of each ion in AB is

Solve the following with regard to significant figures. (a) sqrt(4.5 - 3.31) (b) 5.9 xx 10^(5) - 2.3 xx 10^(4) (c) 7.18 + 4.3 (d) 6.5 + 0.0136

If photoelectrons are to be emitted from a potassium surface with a speed 6 xx 10^(6) ms^(-1) , what frequency of radiation must be used ? (Threshold frequency for potassium is 4.22 xx 10^(14) Hz, h = 6.6 xx 10^(-34) Js, m_(e) = 9.1 xx 10^(-31) kg)

Calculate the product of the uncertainties of displacement and velocity of a moving electron having a mass of 9.1 xx 10^(-28) g . Given : h = 6.626 xx 10^(-34) kg m^2 s^(-1) m = 9.1 xx 10^(-28) g = 9.1 xx 10^(-31) kg

What is the radius of the path of an electron ( mass 9 xx 10^(-31) kg and charge 1.6 xx 10^(19) C ) moving at a speed of 3 xx 10^(7) m/s in magnetic field of 6 xx 10^(-4) T perpendicular to it ? What is its frequency ? Calculate its energy in keV. (1 eV = 1.6 xx 10^(-19) J)

Compute the speed of the electromagnetic wave in a medium if the amplitude of electric and magnetic fields are 3 xx 10^(4) N C^(-1) and 2 xx 10^(-4)T, respectively.

A moving electron has 4.55 xx 10^(-25) joules of kinetic energy. Calculate its wavelength (mass = 9.1 xx 10^(-31) kg and h = 6.626 xx 10^(-34) kg m^2 s^(-1) ).