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Physics NCERT Exemplar Solutions Class 11th Chapter Eight

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Class 12th

The work functions of Caesium (Cs), Potassium (K) and Sodium (Na) are $2.14 e V, 2.30 e V$ and $2.75 e V$ respectively. If incident electromagnetic radiation has an incident energy of $2.20 e V$ , which of these photosensitive surfaces may emit photoelectrons?

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alok kumar singh

Contributor-Level 10

Let height of bridge $= h$

Displacement of ball, $S = - h$

$\begin{array}{r} S = u t + \frac{1}{2} {a t}^{2} \\ - h = 4 * 4 + \frac{1}{2} (- 10) (4)^{2} \\ \Rightarrow h = 64 m \end{array}$

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Atoms

The minimum wavelength of X-rays produced by an electron accelerated through a potential difference of $V$ volts is proportional to:

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Physics Wave Optics

For Young's double slit experiment, two statements are given below:

Statement I: If screen is moved away from the plane of slits, angular separation of the fringes remains constant.

Statement II: If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases.

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

Factual (theory based)

Capacitor in parallel removes the AC ripple from the rectified output.

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Physics Ray Optics and Optical Instruments

Light travels a distance $x$ in time $t 1$ in air and $10 x$ in time $t 2$ in another denser medium. What is the critical angle for this

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alok kumar singh

Contributor-Level 10

$\frac{N}{N_{0}} = \frac{1}{16} = {(\frac{1}{2})}^{\frac{t}{T_{1 / 2}}}$

$t = 4 T_{1 / 2} = 20 * 4 = 80 minutes$

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Physics Electromagnetic Waves

In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of $2.0 * 10^{10} H z$ and amplitude $48 {V m}^{- 1}$ . Then the amplitude of oscillating magnetic field is:

(Speed of light in free space $= 3 * 108 {m s}^{- 1}$ )

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alok kumar singh

Contributor-Level 10

$? \frac{1}{λ} = R (\frac{1}{n_{2}^{2}} - \frac{1}{n_{1}^{2}})$

$\Rightarrow \frac{1}{λ} = R (\frac{1}{2^{2}})$

$\Rightarrow λ = \frac{4}{R}$

$\frac{1}{λ^{'}} = R (\frac{1}{4^{2}})$

$\Rightarrow λ^{'} = \frac{16}{R}$

$\Rightarrow λ^{'} = 4 λ$

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Class 12th

An ac source is connected to a capacitor $C$ . Due to decrease in its operating frequency:

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alok kumar singh

Contributor-Level 10

Speed of light in air is

$C = \frac{x}{t_{1}}$

Speed of light in another denser medium.

$C_{2} = \frac{10 x}{t_{2}}$

$\Rightarrow μ = \frac{C}{C_{2}} = \frac{x}{t_{1}} * \frac{t_{2}}{10 x}$

$\Rightarrow μ = \frac{t_{2}}{10 t_{1}}$

(d) $Δ θ = \frac{λ}{d}$

$Δ θ$ is proportional to $λ$ but independent of $D$ .

for minimum wavelength, maximum loss of energy

$e V = (\frac{h c}{λ})$

$λ \propto (\frac{1}{V})$

(b) Incident energy $= 2.20 e V$

If $? < 2.20 e V$ electron will emit.

$? > 2.20 e V$ No electron emission

Only caesium will emit electron

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Physics Alternating Current

A $12 V, 60 W$ lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $220 V$ . Assuming the transformer to be ideal, what is the current in the primary winding?

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alok kumar singh

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$B = \frac{E}{C} = \frac{48}{3 * 10^{8}} = 16 * 10^{- 8}$

$= 1.6 * 10^{- 7} T$

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Physics NCERT Exemplar Solutions Class 11th Chapter Eight Physics Current Electricity

If n represents the actual number of deflections in a converted galvanometer of resistance G and shunt resistance S. Then the total current I when its figure of merit is K will be:

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