By using Einstein photoelectric equation, if we consider kinetic energy of photo electrons on y-axis and frequency of incident radiation on x-axis. The slope of the graph will represent (the symbols have their usual meanings)

The kinetic energy of an electron in a given orbit in a hydrogen atom is : (symbols have their usual meaning)

A digital signal
A. does not provides a continuous set of values.
B. can utilise binary system
C. represents values as discrete steps
D. can utilise decimal as well as binary system
Choose the correct anser from the options given below:

As the frequency of an ac circuit increases, the current first increases till it becomes maximum at resonance and then decreases. Which one of the following combinations of circuit elements are likely to comprise the circuit ?

A wire has a resistance of \( 2.1 \, \Omega \) at \( 25^\circ \text{C} \) and a resistance of \( 2.8 \, \Omega \) at \( 100^\circ \text{C} \). The temperature coefficient of the resistance is :

In LCR series circuit with resistance R, inductive reactance \( X_L \) and capacitive reactance \( X_C \), the maximum current '\( I_0 \)' at resonance is given as :

Why do light emitting diodes are preferred over conventional incandescent low power lamps?

Read the passage carefully and answer the Questions:
According to Valence Bond theory, the metal atom or ion under the influence of ligands can use its \((n-1) d, n s, n p\) or \(n s, n p, n d\) orbitals for hybridisation to yield a set of equivalent orbitals of definite geometry such as octahedral, tetrahedral, square planar and so on. These hybridised orbitals are allowed to overlap with ligand orbitals that can donate electron pairs for bonding.
While the VB theory, to a larger extent, explains the formation, structures and magnetic behaviour of coordination compounds, it suffers from the many shortcomings. The Crystal field theory (CFT) is an electrostatic model which considers the metal-ligand bond to be ionic arising purely from electrostatic interactions between the metal ion and the ligand. The five \(d\) orbitals in an isolated gaseous metal atom/ion have same energy, i.e., they are degenerate. This degeneracy is maintained if a spherically symmetrical field of negative charges surrounds the metal atom/ion. However, when this negative field is due to ligands in a complex, it becomes asymmetrical and the degeneracy of the \(d\) orbitals is lifted. It results in splitting of the \(d\) orbitals. The pattern of splitting depends upon the nature of the crystal field.
The spin only magnetic moment of \(\left[ MnBr _4\right]^{2-}\) is 5.9 BM. Predict the geometry of the complex ion?

Kirchhoff's second law for an electric network is based on:

A dishonest delivery man purchases 20 liters of pure milk and dilutes it by adding 4 liters of water. If he sells the diluted milk at \(Rs .50 / L\), then what is the cost price of pure

A charge of \( 20\mu C \) lies at the centre of a square. Work done in carrying a charge of \( 5\mu C \) from one corner of the square to the diagonally opposite corner is :

The value of \(k\) for which the lines \(\frac{2 x-3}{4}=\frac{3-y}{k}=\frac{z-2}{-2}\) and \(\frac{x-2}{1}=\frac{y}{4}=\frac{5-z}{3}\) are perpendicular to each other is :

If \(\vec{a}=5 \hat{i}-\hat{j}-3 \hat{k} \& \vec{b}=\hat{i}-3 \hat{j}+5 \hat{k}\) the angle between \(\vec{a}+\vec{b}\) and \(\vec{a}-\vec{b}\) is: