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9 months ago

Physics Class 11th

A small elastic ball of mass m is placed at the apex of a $45 °$ inclined plane as shown in the figure below. The ball is allowed to slip without friction down the plane (along the dotted line), hit the ground (as shown) and bounce along it. If the height of the inclined plane is h and the coefficient of restitution between the ball and the ground is 0.5, then the distance AB, as marked on the figure, will be N * h, where N is

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Vishal Baghel

Contributor-Level 10

$R = u_{x} * T$

$= \sqrt[]{g h} * \frac{0.5 \sqrt[]{g h} * 2}{g} = h$

$\Rightarrow A B = h + h = 2 h$

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New answer posted

9 months ago

Physics Physics Ray Optics and Optical Instruments

You are trying to construct a compound microscope given two lenses with focal lengths f₁ = 1.0cm and f₂ = 4.0cm. How far apart (in cm) should you place the lenses in order to obtain an angular magnification of 60? (Assume normal adjustment of microscope)

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Vishal Baghel

Contributor-Level 10

For better resolution, smaller focal length should be objective.

h0 = 1 cm fe = 4cm.

$\begin{array}{l} Q_{0} = \frac{h_{0}}{25} \\ Q = \frac{60 h_{0}}{25} = \frac{h_{I}}{4} \end{array}$

$\frac{L - 5}{1} = \frac{h_{I}}{h_{0}} = \frac{240}{25}$

L = 14.6 cm

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9 months ago

Physics Waves

A wave given by equation y = 1mm sin $(\frac{n x}{30} - 5 n t)$ is produced in a string 100m long of mass 1 kg. What is the tension (in N) in string? x is in m & t in sec.

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Vishal Baghel

Contributor-Level 10

$v = \frac{ω}{k} = \frac{5 π * 30}{π} = 150 = \sqrt[]{\frac{\frac{T}{1}}{100}}$

$\Rightarrow T = \frac{2250000}{100} = 225 N$

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New answer posted

9 months ago

Physics 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?

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Vishal Baghel

Contributor-Level 10

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

$λ_{1} = 810 n m$

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New answer posted

9 months ago

Physics Class 12th

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:-

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Vishal Baghel

Contributor-Level 10

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

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

$= \frac{3}{3 / 100} = 100 Ω$

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9 months ago

Physics Class 12th

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

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Vishal Baghel

Contributor-Level 10

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

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

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New answer posted

9 months ago

Physics 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:-

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Vishal Baghel

Contributor-Level 10

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

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New answer posted

9 months ago

Physics 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.

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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

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New answer posted

9 months ago

Physics Electromagnetic Induction

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

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Vishal Baghel

Contributor-Level 10

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

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9 months ago

Physics 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-

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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

$B 2 π r = μ_{0} J π R^{2}$

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

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