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11 months ago

Physics Class 11th

Given below are two statements:

Statement I : In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell's distribution.

Statement II : In a diatomic molecule, the rotational energy at a given temperature equals the translational kinetic energy for each molecule.

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

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Payal Gupta

Contributor-Level 10

Translational kinetic energy will be equal to rotational kinetic energy corresponds to each degree of freedom.

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11 months ago

Physics Physics Motion in Straight Line

A stone is dropped from the top of a building. When it crosses a point 5m below the top, another stone starts to fall from a point 25m below the top. Both stones reach the bottom of building simultaneously. The height of the building is

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Payal Gupta

Contributor-Level 10

When second stone is released

Equation for first ball:

$x + 20 = 10 t + \frac{1}{2} g t^{2}$

Equation for second ball :

$x = \frac{1}{2} g t^{2}$

Using these two equation

20 = 10t t = 2 sec

$x = \frac{1}{2} * 10 * 4 = 20 m$

H = 20 + 20 + 5 = 45 m.

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11 months ago

Physics Physics Alternating Current

An LCR circuit contains resistance of 110 $Ω$ and a supply of 220 V at 300 rad/s angular frequency. If only capacitance is removed from the circuit, current lags behind the voltage by 45°. If on the other hand, only inductor is removed the current leads by 45° with the applied voltage. The rms current flowing in the circuit will be

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Payal Gupta

Contributor-Level 10

When capacitor is removed

tan 45° = $\frac{X_{L}}{X_{R}} \Rightarrow ω L = R$

When inductor is removed.

$t a n 45 ° = \frac{X_{C}}{X_{R}} \Rightarrow \frac{1}{ω C} = R$

$i_{0} = \frac{V_{0}}{Z} = \frac{V_{0}}{\sqrt[]{R^{2} + {(ω L - \frac{1}{ω C})}^{2}}} = \frac{V_{0}}{R} = \frac{220}{110} = 2 A$

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11 months ago

Physics Class 11th

If e is the electronic charge, c is the speed of light in free space and h is Planck's constant, the quantity $\frac{1}{4 π ε_{0}} \frac{{| e |}^{2}}{h c}$ has dimensions of

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Payal Gupta

Contributor-Level 10

$\frac{1}{4 π ε_{0}} \frac{{| e |}^{2}}{h c} = \frac{1}{4 π ε_{0}} \frac{{| e |}^{2}}{r^{2}} * \frac{r^{2}}{\frac{h c}{λ} * λ} = \frac{F r * r}{E * λ}$

Dimension of 'Fr' and 'E' are same dimensionless

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11 months ago

Physics Class 12th

For extrinsic semiconductors; when doping level is increased

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Payal Gupta

Contributor-Level 10

Fermi level of p-type semiconductors will go downward

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11 months ago

Physics Class 12th

The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V. When the incident wavelength is changed to a new value, the stopping potential is 1.43V. The new wavelength is

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Payal Gupta

Contributor-Level 10

Stopping potential defined in terms of wavelength as :

$e V = \frac{h c}{λ} - ? \Rightarrow 0.710 e V = \frac{h c}{491} - ? \Rightarrow 1.43 e V = \frac{h c}{λ} - ?$

Using above two equation we can calculate :

$λ = 382 n m$

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11 months ago

Physics Class 12th

The truth table for the following, logic circuit is

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Payal Gupta

Contributor-Level 10

Using truth table of logic gates

$Y = \bar{(A \bar{B}) + (\bar{A} B)} = \bar{((A \bar{B}))} \bar{((\bar{A} B))}$

$Y = (\bar{A} + \bar{B}) (\bar{A} + \bar{B}) = (\bar{A} + B) (A + \bar{B}) = A B + \bar{A} \bar{B}$

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11 months ago

Physics Physics Thermodynamics

Thermodynamic process is shown below on a P-V diagram for one mole of an ideal gas. If V₂ = 2V₁ then the ratio of temperature T₂/T₁ is

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Payal Gupta

Contributor-Level 10

Since equation of the gas process is given so we can convert it into T & V form.

$P V^{\frac{1}{2}} = C$

$\Rightarrow \frac{T}{\sqrt[]{V}} = C$

$\Rightarrow \frac{T_{1}}{V_{1}} = T_{2}$ $V_{2}$

$\Rightarrow \frac{T_{1}}{T_{2}} =$ = $\frac{1}{\sqrt[]{2}}$

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11 months ago

Physics Physics Oscillations

The point A moves with a uniform speed along the circumference of a circle of radius 0.36m and covers 30° in 0.1s. The perpendicular projection 'P' from 'A' n the diameter MN represents the simple harmonic motion of 'P'. The restoration force per unit mass when P touches M will be

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Payal Gupta

Contributor-Level 10

As we know that maximum acceleration will act on the particle when it is at extreme position .

$ω = \frac{\frac{π}{6}}{0.1} = \frac{10 π}{6}$

$f = m ω^{2} x$

$\frac{f}{m} = ω^{2} A = \frac{1000 π^{2}}{36} * 0.36 = π^{2} = 9.87 N$

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11 months ago

Physics Electric Charges and Fields

Why is an electric charge a scalar quantity?

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Pallavi Arora

Beginner-Level 5

When two or more individual charges are present in a system, the total charge will be an algebraic sum of all individual charges and not the vector sum. Therefore, an electric charge is considered as a scalar quantity.

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