Which one of the following statements is not correct?

If $\log x : \log y : \log z = (y - z) : (z - x) : (x - y)$,then

$A$ Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

For a constant hydraulic stress on an object,the fractional change in the object's volume $\left( \frac{\Delta V}{V} \right)$ and its bulk modulus $(B)$ are related as

$100 \ g$ of water is heated from $30^{\circ}C$ to $50^{\circ}C$. Neglecting the slight expansion of water,the change in its internal energy is ....... $kJ$? (Specific heat of water = $4184 \ J/kg\cdot K$)

$A$ long solenoid has $200$ turns per cm and carries a current $i$. The magnetic field at its centre is $6.28 \times 10^{-2} ~Wb/m^2$. Another long solenoid has $100$ turns per cm and it carries a current $\frac{i}{3}$. The value of the magnetic field at its centre is nearly: