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Physics Class 12th

Draw truth table of given gate circuit.

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alok kumar singh

Contributor-Level 10

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

$(\bar{A + \bar{B}}) \cdot (\bar{\bar{A} + B})$

$(\bar{A} \cdot \bar{B}) \cdot (\bar{A} \cdot \bar{B})$

$(\bar{A} \cdot B) \cdot (A \cdot \bar{B}) = \bar{A} \cdot B \cdot A \cdot \bar{B} = 0$

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a month ago

Physics Physics Ray Optics and Optical Instruments

Radius of curvature of equiconvex lens is 20 cm. Material of lens is having refractive index of 1.5. Find image distance from lens if an object is placed 10 cm away from the lens.

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alok kumar singh

Contributor-Level 10

$\frac{1}{f} = (μ - 1) (\frac{2}{R})$ f = 20 cm

$\frac{1}{v} - \frac{1}{u} = \frac{1}{f}$

$\frac{1}{v} + \frac{1}{10} = \frac{1}{20}$

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Physics Class 12th

In a photoelectric experiment, frequency f = 1.5f₀ (f₀ : threshold frequency). If the frequency of light is changed to f/2, then photocurrent becomes (intensity of light has doubled)

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

Since $\frac{f}{2} < f_{0}$

->current = 0

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a month ago

Physics Class 12th

Find average power in electric circuit if source voltage (V) = 20sin(100wt) and current in the circuit (I) = 2sin(100wt + $\frac{π}{3}$ )

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alok kumar singh

Contributor-Level 10

= IV cosf

$= \frac{20}{\sqrt[]{2}} * \frac{2}{\sqrt[]{2}} *$ cos 60°

= 10 W

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a month ago

Physics Thermodynamics

Find the speed of sound in oxygen gas at STP.

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alok kumar singh

Contributor-Level 10

Kindly go though the solution

$v = \sqrt[]{\frac{γ R T}{M}} = 330 m / s$

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a month ago

Physics Class 12th

If the current through an incandescent lamp decreases by 20%, how much change will be there in its illumination?

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alok kumar singh

Contributor-Level 10

Kindly go through the solution

p = i²R

P' = 0.64 i²R

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a month ago

Physics Class 11th

Two solid spheres each of mass 2 kg and radius 75 cm are arranged as shown. Find MOI of the system about the given axis.

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alok kumar singh

Contributor-Level 10

$I = (\frac{2}{5} M R^{2} + M R^{2}) * 2$

$= \frac{14}{5} * 2 * \frac{9}{16}$

$= \frac{63}{20}$

= 3.15 kg m²

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a month ago

Physics Physics Wave Optics

Unpolarised light incident on transparent glass at incident angle 60°. If reflected ray is completely polarised, then angle of refraction is

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alok kumar singh

Contributor-Level 10

By Brewsters law

m = tani

m = $\sqrt[]{3}$

$1 * \frac{\sqrt[]{3}}{2} = \sqrt[]{3} * s i n r$

$s i n r = \frac{1}{2}$

r = 30°

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a month ago

Physics Units and Measurement

If $E = \frac{A - x^{2}}{B t}$ where E is energy, x is displacement and t is time. Find dimensions of AB

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alok kumar singh

Contributor-Level 10

[A] = L²

$B = \frac{x^{2}}{t E} \equiv \frac{L^{2}}{T M L^{2} T^{- 2}} = \frac{1}{M T^{- 1}}$

[B] = M^–1T

[AB] = [M^–1L²T]

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a month ago

Physics Work, Energy and Power

Force on a particle moving in straight line is given by $\vec{F} = 6 t^{2} \hat{i} - 3 t \hat{j}$ and velocity is $\vec{v} = 3 t \hat{i} + 6 t \hat{j}$ . Find power at t = 2.

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alok kumar singh

Contributor-Level 10

$P = \vec{F} \cdot \vec{v}$

= 18t⁴ – 18t²

->P (t = 2) =18 [16 − 4] = 216 W

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