# Blog

### Rajasthan Board Class 12 Biology Syllabus

The RBSE (Rajasthan Board of Secondary Education) has prepared a detailed syllabus for Class 12 Biology exam of 2021-22. The syllabus is comprehensive and has been designed in such a manner that it...

### How to prepare for a Viva

How to prepare for a Viva : We all agree that exams can be scary and stressful for most of us, especially the external Viva examinations!  To help ease your stress, we at Noon, wish to take you...

### Calculate the threshold frequency of photon for photoelectric emission from a metal of work function .

Ans: Given is the work function $0.1 \mathrm{eV}$, $$\phi_{o}=h v_{0}$$ Class 12 Physics $\underline{\text { wuw. vedantu.com }}$ 1 $10 a-x=10 a-2.5 a=7.5 a$ from charge $9 q$

### Consider interference between two sources of intensities I and 4I. What will be the intensity at points where phase differences are:

Ans: We know that, $I=a^{2}+b^{2}+2 a b \cos \phi$ Where, $a$ and $b$ are amplitudes of two coherent waves that are having phase difference of $\phi$. Here $a^{2}=I, b^{2}=41$  \begin{array}{l}...

### Write two points of difference between interference and diffraction.

Ans: Some differences between interference and diffraction are the following: \begin{tabular}{|l|l|} \hline \multicolumn{1}{|c|}{ Interference } & \multicolumn{1}{c|}{ Diffraction } \\ \hline...

### At a certain location in Africa, a compass points west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be Specify the direction and magnitude of the earth’s field at the location.
Ans: In the above question it is given that: Angle of declination, $\theta=12^{\circ}$ Angle of dip, $\delta=60^{\circ}$ Horizontal component of earth's magnetic field, $B_{H}=0.16 \mathrm{G}$...