When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. Explain why?

A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm. If the density of the substance in the crystal is \(8gcm^{-3}\) , then the number of atoms present in 256 g of the crystal is \(N\times 10^{24}\) . The value of N is

Chemistry|Class 12

Differentiate \(\sin ^{2}(\theta ^{2}+1)\) w.r.t. \(\theta ^{2}\)

Math|Class 12

When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light wave?

Physics|Class 12

The number of hexagonal faces that are present in a truncated octahedron is

Chemistry|Class 12

Find \(\frac {dy}{dx}\) if \(y=\sin ^{-1}(\frac {\sqrt {x}-1}{\sqrt {x}+1})+\sec^{-1}(\frac {\sqrt {x}+1}{\sqrt {x}-1})\)

Math|Class 12

A body travels \(2\ m\) in the first \(2\ seconds\) and \(2.2\ m\) in the next four seconds. What will be the velocity of body at the end of \(7th\) second from the start?

Physics|Class 11

For an endothermic reaction, where \(\Delta H\) represents the enthalpy of the reaction in \(kJ/mol\), the minimum value for the energy of activation will be（）

A. less than \(\Delta H\)

B. zero

C. more than \(\Delta H\)

D. equal to \(\Delta H\)

For an endothermic reaction, where \(\Delta H\) represents the enthalpy of the reaction in \(kJ/mol\), the minimum value for the energy of activation will be（）

A. less than \(\Delta H\)

B. zero

C. more than \(\Delta H\)

D. equal to \(\Delta H\)

Chemistry|Class 12

A solution is prepared by dissolving \(0.6g\) of urea (molar mass \(=60g mol^{-1}\))and \(1.8g\) of glucose (molar mass \(=180gmol^{-1}\)) in \(100 mL\) of water at \(27^{\circ }C\). The osmotic pressure of the solution is \((R=0.08206L atmK^{-1} mol^{-1}\))（）

A. \(8.2atm\)

B. \(2.46atm\)

C. \(4.92atm\)

D. \(1.64atm\)

A solution is prepared by dissolving \(0.6g\) of urea (molar mass \(=60g mol^{-1}\))and \(1.8g\) of glucose (molar mass \(=180gmol^{-1}\)) in \(100 mL\) of water at \(27^{\circ }C\). The osmotic pressure of the solution is \((R=0.08206L atmK^{-1} mol^{-1}\))（）

Copper sulphate solution \((250mL)\) was electrolysed using a platinum anode and a copper cathode. A constant current of \(2 mA\) was passed for 16 min.It was found that after electrolysis the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate in the solution to begin with.

Chemistry|Class 12

Silver (atomic weight \(=108gmol^{-1})\) has a density of\(10.5gcm^{-3}\) . The number of silver atoms on a surface of area \(10^{-12}m^{2}\) can be expressed in scientific notation as \(y\times 10^{x}\) The value of \(x\) is

Chemistry|Class 12

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