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11 months ago

Physics Class 12th

Match List I with List II.

List I List II

(a) Rectifier (i) Used either for stepping up or stepping down the a.c. voltage

(b) Stabilizer (ii) Used to convert a.c. voltage into d.c. voltage

(c) Transformer (iii) Used to remove any ripple in the rectified output volt

...more

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New answer posted

11 months ago

Physics Class 11th

Y = A sin $(ω t + ?_{0})$ is the time-displacement equation of a SHM. At t = 0 the displacement of the particle is y = $\frac{A}{2}$ and it moving along negative x-direction. Then the initial phase angle $?_{0}$ will be

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Payal Gupta

Contributor-Level 10

Using general equation of SHM :

$y = A s i n (ω t + ?_{0}) = \frac{A}{2}$

$ω t + ?_{0} = \frac{π}{6}, \frac{5 π}{6}$

At t = 0

$?_{0} = \frac{π}{6}, \frac{5 π}{6}$

Since it is moving in – x direction

$? = \frac{5 π}{6}$

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11 months ago

Physics Physics Electric Charge and Field

An electron with kinetic energy K₁ enters between parallel plates of a capacitor at an angle 'α' with the plates. It leaves the plates at angle 'β' with kinetic energy K₂. Then the ratio of kinetic energies K₁ : K₂will be

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Payal Gupta

Contributor-Level 10

Since force will act in horizontal direction so vertical component of speed will be same

v₁ cos α = v₂ cos β

$\Rightarrow \frac{K_{1}}{K_{2}} = {(\frac{v_{1}}{v_{2}})}^{2} = \frac{c o s^{2} β}{c o s^{2} α}$

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11 months ago

Physics Physics Magnetism and Matter

In a ferromagnetic region with zero magnetization.

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Payal Gupta

Contributor-Level 10

In ferromagnetic material, below Curie's temperature, a domain is defined as macroscopic region with zero magentisation.

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11 months ago

Physics Physics Atoms

The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is

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Payal Gupta

Contributor-Level 10

Using Bohr's theory :

$λ = \frac{h c}{E_{2} - E_{1}} = \frac{1242 e V - n m}{(- 3.4) - (- 13.6)} = 121.8 n m$

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11 months ago

Physics Work, Energy and Power

A sphere of radius 'a' and mass 'm' rolls along a horizontal plane with constant speed v₀. It encounters and inclined plane at angle θ and climbs upward. Assuming that it rolls without slipping, how far up the sphere will travel?

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Payal Gupta

Contributor-Level 10

Using conservation of energy between initial and final position shown :

$[\frac{1}{2} (\frac{2}{5} m a^{2}) {(\frac{V_{0}}{a})}^{2} + \frac{1}{2} m V_{0}^{2}] + 0 = m g l s i n θ$

$\Rightarrow \frac{7}{10} m V_{0}^{2} = m g l s i n θ$

$\Rightarrow l = \frac{7 v_{0}^{2}}{10 g s i n θ}$

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11 months ago

Physics Dual Nature of Radiation and Matter

An electron of mass m_e and a proton of mass m_p = 1836 m_e are moving with the same speed. The ratio of their de Broglie wavelength $\frac{λ_{e l e c t r o n}}{λ_{p r o t o n}}$ will be

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Payal Gupta

Contributor-Level 10

Using de-Broglie equation for wave nature of particle :

$λ = \frac{h c}{m v} \Rightarrow λ α \frac{1}{m}$

$\frac{λ_{e}}{λ_{P}} = \frac{\frac{1}{m_{e}}}{\frac{1}{m_{P}}} = \frac{m_{P}}{m_{e}} = 1836$

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11 months ago

Physics Physics Wave Optics

Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter $0.1 μ m .$ If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that

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Payal Gupta

Contributor-Level 10

Using diffraction formula of circular hole :

$r α \frac{1}{D}$

size will decease.

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11 months ago

Physics Class 12th

If a message signal of frequency 'f_m' is amplitude modulated with a carrier signal of frequency 'f_c' and radiated through an antenna, the wavelength of the corresponding signal in air is

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