Physics

V = 1.24 * 10⁶ volt

${\lambda }_{min}=?$

${\lambda }_{min}=\frac{hc}{eV}=\frac{1242nm}{e\left(1.24*10^6\right)}=\frac{1000*10^{-9}}{10^6}\Rightarrow {\lambda }_{min}=10^{-3}nm$

Here, $K_{eq}=2k$ ${}_{}$

$T=2\pi \sqrt[]{\frac{m}{2k}}$

$\therefore f=\frac{1}{2\pi }\sqrt[]{\frac{2k}{m}}$

$\Delta E=hv\to \left(\frac{1}{n_2^2}-\frac{1}{n_1^2}\right)$

(1) n₁ = 3, n₂ = 2

    $\left(\frac{1}{2^2}-\frac{1}{3^2}\right)=\frac{9-4}{36}=\frac{5}{36}$         

(2) n₁ = 4, n₂ = 3

$\left(\frac{1}{3^2}-\frac{1}{4^2}\right)=\frac{16-9}{144}=\frac{7}{144}$        

(3) n₁ = 2, n₂ = 1

$\left(\frac{1}{1^2}-\frac{1}{2^2}\right)=\frac{4-1}{4}=\frac{3}{4}$  

(4) n₁ = 5, n₂ = 4

$\left(\frac{1}{4^2}-\frac{1}{5^2}\right)=\frac{25-16}{400}=\frac{9}{400}$

$F_{net}=\frac{2kee}{\left(d^2+x^2\right)}sin\theta =\left(\frac{2k{e}^2}{\left(d^2{+}^2\right)}\right)\theta$

[for small displacement i.e, x is small so|, sin $\approx$ $\approx$ $$ $$ tan ]

$\frac{{}^{}}{}$ $=\frac{2k{e}^2}{\left(d^2+x^2\right)}.\frac{x}{d}=2.\frac{1}{4\pi {\epsilon }_0}{q}^2\frac{x}{d^3}$   [q = e]

$=\frac{q^2}{2\pi {\epsilon }_0{d}^3}x=m{\omega }^{2}x$

$\therefore \omega =\sqrt[]{\frac{q^2}{2\pi {\epsilon }_0{d}^{3}m}}$

$F=-\alpha x^2\Rightarrow \frac{mvdv}{dx}=-\alpha x^2$

$\Rightarrow {\displaystyle \underset{v_0}{\overset{0}{\int }}vdv=-\frac{\alpha }{m}{\displaystyle \underset{0}{\overset{x}{\int }}{x}^{2}dx\Rightarrow \frac{0^2}{2}-\frac{v_0^2}{2}=\frac{-\alpha }{3m}{x}^3}}$

$\Rightarrow \frac{-v_0^2}{2}=-\frac{\alpha }{3m}{x}^3\Rightarrow x={\left(\frac{3v_0^{2}m}{2\alpha }\right)}^{1/3}$

A tristor is formed by doping a semi conductor water from one side by N-type dopant (high concentration while comparatively lower concentration on other side thus forming NPN tristor & vice-versa.

So, statement (I) is false & statement (II) is true.

When a soft ferromagnetic substance is placed in external magnetic field, the size of domain lying in the opposite direction of external magnetic field increases while size of domain lying in the opposite direction of field decreases if field is weak. However, if field is strong then the domain rotate in the direction of external magnetic field due to strong torque.

As we go pole to equator, acceleration due to gravity decreases. So, weight of the body will also reduces. Thus, weight on equator will be slightly smaller than 49 N.

Zener break down occurs in p-n junction having p and n both : Heavily doped and have narrow depletion layer.

$T=2\pi \sqrt[]{\frac{L}{g}}or{T}^2=4{\pi }^2\left(\frac{L}{g}\right)$

$\Rightarrow g=4{\pi }^2\left(\frac{L}{T^2}\right)$

$\Rightarrow \frac{\Delta g}{g}\mathrm{\%}=\left(\frac{\Delta L}{L}+\frac{2\Delta T}{T}\right)\mathrm{\%}=\left[\frac{1mm}{1m}+\frac{2*0.01}{1.95}\right]*100\mathrm{\%}=\left(0.001+0.0102\right)*100=1.13\mathrm{\%}$