Class 12th

Given I = 2r

${\mu }_1=1\left(Air\right)$

${\mu }_2=\sqrt[]{2n}$

by, Snell's law

$\mu sini={\mu }_{2}sinr$

$i=2co{s}^{-1}\left[\sqrt[]{\frac{n}{2}}\right]$

$V_0=\frac{1}{5}C$

$V_0=\frac{C}{5},V_S=0$

$f=f_0\left[\frac{C+V_0}{C+V_s}\right]$

V0 observer velocity

C sound velocity

Vs source velocity

$=\frac{\frac{6}{5}{f}_0-f_0}{f_0}*100$

$=\frac{1}{5}*100$

% change in frequency = 20%

$\mathrm{}{\mathrm{M}\mathrm{A}}_2{\mathrm{B}}_2$ shows geometrical and not optical isomerism.

$F=qE\left[E=\frac{\sigma }{{\epsilon }_0}\right]$

$F=\frac{q\sigma }{{\in }_0}=10N$

Final case – Now one plate is removed, Electric field will becomes half; So, force will become half.

$F\text{'}=\frac{10}{2}=5N$

$\lambda =\frac{h}{mv}=\frac{h}{\sqrt[]{2MK.E}}$

$\lambda \alpha \frac{1}{\sqrt[]{m}}$

$\Rightarrow {\lambda }_{\alpha }\sqrt[]{m_{\alpha }}={\lambda }_{C_{12}}\sqrt[]{m_{C_{12}}}$

$\Rightarrow \frac{{\lambda }_{\alpha }}{{\lambda }_{C_{12}}}=\sqrt[]{\frac{m_{C_{12}}}{m_{\alpha }}}=\sqrt[]{\frac{12}{4}}=\sqrt[]{3}:1$

Carbon-chlorine bond cleavage is not possible in ${\mathrm{C}\mathrm{H}}_3=\mathrm{C}\mathrm{H}-\mathrm{C}\mathrm{l}$

Ultraviolet rays – sterilizing surgical instrument

Microwaves – Radar system

Infrared waves – Greenhouse effect

X-rays – Study crystal structure

Given, I = 5 sin (120πt), $\omega$ $$ = 120

$T=\frac{2\pi }{\omega }$

$T=\frac{2\pi }{120\pi }=\frac{1}{60}sec,\frac{T}{4}=\frac{1}{60*4}=\frac{1}{240}sec$

Each ion makes a definite contribution irrespective of the other ion

$\begin{array}{rr}& {\left({\mathrm{\Lambda }}_{\mathrm{m}}^0\right)}_{\mathrm{N}\mathrm{a}\mathrm{B}\mathrm{r}}-{\left({\mathrm{\Lambda }}_{\mathrm{m}}^0\right)}_{\mathrm{N}\mathrm{a}\mathrm{l}}={\mathrm{\Lambda }}_{{\mathrm{m}\mathrm{B}\mathrm{r}}^{-}}^0-{\mathrm{\Lambda }}_{{\mathrm{m}}_{{\mathrm{r}}^{-}}}^0\\ & {\left({\mathrm{\Lambda }}_{\mathrm{m}}^0\right)}_{\mathrm{K}\mathrm{B}\mathrm{r}}-{\left({\mathrm{\Lambda }}_{\mathrm{m}}^0\right)}_{\mathrm{N}\mathrm{a}\mathrm{B}\mathrm{r}}={\mathrm{\Lambda }}_{{\mathrm{m}\mathrm{K}}^{+}}^0-{\mathrm{\Lambda }}_{{\mathrm{m}\mathrm{N}\mathrm{a}}^{+}}^0\end{array}$