Tags Class 12th

Class 12th

Get insights from 12k questions on Class 12th, answered by students, alumni, and experts. You may also ask and answer any question you like about Class 12th

Follow Ask Question

12k

Questions

Discussions

Active Users

Followers

New answer posted

11 months ago

Class 12th Physics Wave Optics

When light of wavelength 540 nm passes through a single slit of unknown width, the diffraction pattern displays a second maximum where the first minimum of light of an unknown wavelength had been observed to fall. What is the unknown wavelength?

0 Follower 24 Views

Vishal Baghel

Contributor-Level 10

$\frac{λ_{1}}{w} = \frac{3 * 540}{2 w}$

$λ_{1} = 810 n m$

0 0

New answer posted

11 months ago

Class 12th Physics

Drawing power form a 12V car battery, a 9V stabilized DC voltage is required to power a car stereo system, attached to the terminals A and B, as shown in the figure. If a Zener diode with ratings, V_z = 9V and P_max = 0.27 W, is connected as shown in the figure, for the above purpose, the minimum series resistance R_s must be:-

0 Follower 22 Views

Vishal Baghel

Contributor-Level 10

$i_{m a x} = \frac{P_{m a x}}{V_{z}} = \frac{3}{100}$

$∴ R_{s_{m i n}} = \frac{V_{R_{S}}}{i_{m a x}}$

$= \frac{3}{3 / 100} = 100 Ω$

0 0

New answer posted

11 months ago

Class 12th Physics

Mass of Bromine, Selenium and Krypton are given as:-

0 Follower 26 Views

Vishal Baghel

Contributor-Level 10

$Q_{(i)} = (M_{B r} - M_{K r}) c^{2} > 0$

$\begin{array}{l} Q_{(i i)} = (M_{B r} - M_{S e} - 2 M_{e}) c^{2} > 0 \\ Q_{(i i)} = (M_{B r} - M_{s e}) c^{2} > 0 \end{array}$

0 0

New answer posted

11 months ago

Class 12th Dual Nature of Radiation and Matter

The sketch shown below illustrates the apparatus and results for a famous experiment. The graph on the right is a polar plot of the number of electrons received in the detector. From the result, the experimenters were able to conclude that:-

0 Follower 9 Views

Vishal Baghel

Contributor-Level 10

This experiment is the famous Davission-Germer experiment which establishes wave nature of electrons.

0 0

New answer posted

11 months ago

Class 12th Communication Systems

A signal containing multiple frequencies is shown in figure A. It is passed through 2 different filters and then outputs are shown in figure B & C.

0 Follower 20 Views

Vishal Baghel

Contributor-Level 10

Low pass filter will allow low frequency signal to pass while high pass filter allow high frequency to pass through

0 0

New answer posted

11 months ago

Class 12th Electromagnetic Induction

A metal sheet is being pulled out of a region of magnetic field. IF the sheet is not magnetic:-

0 Follower 99 Views

Vishal Baghel

Contributor-Level 10

Heat will develop due to eddy current which will oppose the motion and hence a force is required.

0 0

New answer posted

11 months ago

Class 12th Physics Moving Charges and Magnetism

An infinite cylindrical current carrying wire carries a current that is uniformly distributed over its cross section. The magnetic field as a function of distance form it's axis is-

0 Follower 71 Views

Vishal Baghel

Contributor-Level 10

Apply Ampere's Law

For inside

$B 2 π r = μ_{0} J π r^{2}$

$\Rightarrow B \propto r$

For outside

$B 2 π r = μ_{0} J π R^{2}$

$\Rightarrow B \propto \frac{1}{r}$

0 0

New answer posted

11 months ago

Class 12th Physics

Two air filled capacitors are connected as shown. The left capacitor is suddenly filled with a dielectric of constant K. The work done by battery after that is $24 μ J .$ Dielectric constant K is:-

0 Follower 264 Views

Vishal Baghel

Contributor-Level 10

$W D = Δ Q V$

$\Rightarrow Δ Q = 4 μ C$

$Q_{i} = \frac{2 * 4}{2 + 4} * 6 = 8 μ C$

$Q_{f} = 12 μ C = C_{e q} * 6$

$C_{e q} = 2 μ F \Rightarrow C_{1} = C_{2} = 4 μ F$

$k = \frac{C_{1}}{C_{0}} = 2$

0 0

New answer posted

11 months ago

Class 12th Physics

In half deflection method, the resistance of resistance box in series with the galvanometer is 10,000 $Ω$ . When the galvanometer is shunted with 10 $Ω$ resistance, its reading drops to half the initial value. The resistance of galvanometer is:-

0 Follower 61 Views

Vishal Baghel

Contributor-Level 10

$i = \frac{v}{R + G}$

$\frac{i}{2} = \frac{v}{\frac{S G}{S + G} + R} * \frac{S}{S + G}$

$\Rightarrow \frac{2 S}{S G + R G + R S} = \frac{1}{R + G}$

$\frac{S R}{R - S} = G$

R > > S

$\Rightarrow G \approx S$

0 0

New answer posted

11 months ago

Class 12th Physics Wave Optics

A car is moving towards a stationary observer at a speed of 108 km/hr. The speed of sound is 330 m/s. If the observer hears the frequency of horn as 550 Hz, what frequency will he hear after the car has passed?

0 Follower 29 Views

Vishal Baghel

Contributor-Level 10

$v = 108 * \frac{5}{18} = 30 m / s$

$f_{1} = \frac{C}{C - v} f_{0}$

$f = \frac{330}{330 + 30} * 500 = \frac{33}{36} * 500 = \frac{5500}{12}$

0 0

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

66k Colleges
1.2k Exams
710k Reviews
1850k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

Need guidance on career and education? Ask our experts

Your Question

Class 12th

Questions

Discussions

Active Users

Followers

All

Discussions

Unanswered Questions

Share Your College Life Experience