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Physics Class 12th

Draw the output signal Y in the given combination of gates.

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

$y = \bar{\bar{A} + B} = A . \bar{B}$

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Physics Class 12th

Given below are two statements:

Statement I : An electric dipole is placed at the centre of a hollow sphere. The flux of electric field through the sphere is zero but the electric field is not zero anywhere in the sphere.

Statement II : If R is the radius of a solid metallic sphere and Q be the total charge on it. The electric field at any point on the spherical surface of radius r (

In the light of the above statements, choose the correct answer from the option given below:

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alok kumar singh

Contributor-Level 10

All the charge given to a conducting sphere resides on outer surface.

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Physics Atoms

The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state will be:

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alok kumar singh

Contributor-Level 10

$Δ E = 13.6 (\frac{1}{1^{2}} - \frac{1}{5^{2}}) = 13.6 * \frac{24}{25} e V$

$\Rightarrow \frac{h c}{λ} = 13.6 * \frac{24}{25} e V . . . . . . . . . . (1)$

With the help of conservation of linear momentum, we can write

$\frac{h}{λ} = m_{H} v_{H} \Rightarrow \frac{h c}{λ} = c m_{H} v_{H} \Rightarrow v_{H} = \frac{\frac{h c}{λ}}{c m_{H}} = \frac{13.6 * \frac{24}{25} * 1.6 * 1 0^{- 19}}{3 * 1 0^{8} * 1.67 * 1 0^{- 27}} = 4.17 m / s$

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Physics Physics Oscillations

Given below are two statements:

Statement I : A second's pendulum has a time period of 1 second.

Statement II : It takes precisely one second to move between the two extreme positions.

In the light of the above statements, choose the correct answer from the options given below:

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

Time period of second pendulum is 2 seconds.

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2 months ago

Physics Class 12th

A wire of has a length of 1m. It is stretched till its length increases by 25%. The percentage change in resistance to the nearest integer is:

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alok kumar singh

Contributor-Level 10

$R_{i} = \frac{ρ l}{A}$
$R_{f} = \frac{ρ (1.25 l)}{(A / 1.25)} = {(1.25)}^{2} * \frac{ρ l}{A}$

$\Rightarrow R_{f} = 1.5625 * R_{i}$

$\Rightarrow \frac{R_{f} - R_{l}}{R_{l}} * 100 = 56.25 %$

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2 months ago

Physics Physics Ray Optics and Optical Instruments

Given below are two statements : one is labeled as Assertion A and the other is labeled as Reason R.

Assertion A : For a simple microscope, the angular size of the object equals the angular size of the image.

Reason R : Magnification is achieved as the small object can be kept much closer to the eye that 25cm and hence it subtends a large angle.

In the light of the above statements, choose the most appropriate answer from the options given below:

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alok kumar singh

Contributor-Level 10

Fact based

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2 months ago

Physics Class 12th

An aeroplane, with its wings spread 10m, is flying at a speed of 180 km/h in a horizontal direction. The total intensity of earth's field at that part is 2.5 * 10^-⁴Wb/m² and the angle of dip is 60°. The emf induced between the tips of the plane wings will be………….

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alok kumar singh

Contributor-Level 10

B_v = B sin 60°

-> $B_{v} = 2.5 * 1 0^{- 4} * \frac{\sqrt[]{3}}{2}$

$E m f = B_{v} * v * l = 2.5 * 1 0^{- 4} * \frac{\sqrt[]{3}}{2} * 180 * \frac{5}{18} * 1 = 108.25 * 1 0^{- 3} v o l t s$

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Physics Thermodynamics

The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U = 3PV + 4. The gas is:

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alok kumar singh

Contributor-Level 10

U = 3PV + 4

^{$\Rightarrow n C_{v} T = 3 P V + 4$}

$\Rightarrow n * \frac{f R T}{2} = 3 P V + 4$

$\Rightarrow f = 6 + \frac{8}{P V}$

$\Rightarrow f > 6 \Rightarrow p o l y a t o m i c$

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Physics Class 12th

If 'C' and 'V' represent capacity and voltage respectively then what are the dimensions of $λ$ where C/V = $λ ?$

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alok kumar singh

Contributor-Level 10

Kindly go throiugh the solution

$λ = \frac{c}{v} = \frac{Q^{3}}{W^{2}} = \frac{I^{3} T^{3}}{M^{2} L^{4} T^{- 4}} \Rightarrow [λ] = [M^{- 2} L^{- 4} T^{7} l^{3}]$

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2 months ago

Physics Physics Motion in Straight Line

A scooter accelerates from rest for time t₁ at constant rate a₁ and then retards at constant rate a₂ for time t₂ and comes to rest. The correct value of $\frac{t_{1}}{t_{2}}$ will be:

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alok kumar singh

Contributor-Level 10

$t a n α = \frac{v_{m a x}}{t_{1}} = a_{1}$

$t a n β = \frac{v_{m a x}}{t_{2}} = a_{2}$

$\Rightarrow \frac{a_{1}}{a_{2}} = \frac{t_{2}}{t_{1}} \Rightarrow \frac{t_{1}}{t_{2}} = \frac{a_{2}}{a_{1}}$

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