A wave pulse in a string is described by the equation y 1 = 5 3 x - 4 t 2 + 2 and another wave pulse in the same string is described by y 2 = - 5 3 x + 4 t - 6 2 + 2 . The values of y 1 , y 2 and x are in metres and t is in seconds. Which of the following statement is correct?

At x = 1 m , y 1 and y 2 always cancel

y 1 travels along - x -direction and y 2 along + x -direction

Both y 1 and y 2 travel along + x -direction

At time t = 1 s , y 1 and y 2 exactly cancel everywhere

At time t = 3 s , y 1 and y 2 exactly cancel everywhere

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Important Questions on Electronics and Communication

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

The maximum transverse velocity and maximum transverse acceleration of a harmonic wave in a

o n e - d i m e n s i o n a l

string are

1 m s^{- 1}

and

1 m s^{- 2}

respectively. The phase velocity of the wave is

1 m s^{- 1}

. The waveform is

MEDIUM

Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

A simple harmonic motion is represented by:

y = 5 (\sin 3 π t + \sqrt{3} \cos 3 π t) cm

The amplitude and time period of the motion are:

HARD

Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

A particle performing S.H.M. starts from the equilibrium position and its time period is

16 s

. After

2 s

its velocity is

π m s^{- 1} .

Amplitude of oscillation is

(\cos 45^{o} = \frac{1}{\sqrt 2})

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

The displacement of a wave is represented by

y = 0.6 \times 10^{- 3} \sin (500 t - 0.05 x),

where all the quantities are in their proper units. The maximum particle velocity

(i n m s^{- 1})

of the medium is

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

What is rectification? Explain the working of a bridge rectifier.

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

A wave pulse in a string is described by the equation

y_{1} = \frac{5}{{(3 x - 4 t)}^{2} + 2}

and another wave pulse in the same string is described by

y_{2} = \frac{- 5}{{(3 x + 4 t - 6)}^{2} + 2}

. The values of

y_{1}, y_{2}

and

x

are in metres and

t

is in seconds. Which of the following statement is correct?

HARD

Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

Two vectors

\vec{A}

and

\vec{B}

are defined as

\vec{A} = a \hat{i}

and

\vec{B} = a (\cos ω t \hat{i} + \sin ω t \hat{j})

, where a is a constant and

ω = \frac{π}{6} rad s^{- 1} .

|\vec{A} + \vec{B}| = \sqrt{3} |\vec{A} - \vec{B}|

at time

t = τ

for the first time, the value of

τ

in seconds, is_______

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

A travelling wave in a medium is given by the equation

y = asin (ωt - kx)

. The maximum acceleration of the particle in the medium is

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

A laser operating at

3 \times 10^{14} Hz

passes through an aperture of

10^{- 2} m

. The angular spread in radians is

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

Explain by drawing a circuit diagram, how is a

PNP

transistor in common emitter configuration used as an amplifier? Also derive expression for current gain, potential gain.

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

A transverse wave is represented by :

y = \frac{10}{π} sin (\frac{2 π}{T} t - \frac{2 π}{λ} x)

For what value of the wavelength the wave velocity is twice the maximum particle velocity?

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

The bonding is germanium crystal (semiconductor) is

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

A progressive wave travelling along the positive

x -

direction is represented by

y (x, t) = A s i n (k x - ω t + ϕ)

. Its snapshot at

t = 0

is given in the figure.
Question Image

For this wave, the phase

ϕ

is:

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

Consider a wire with density

(d)

and stress

(σ) .

For the same density, if the stress increases

2

times, the speed of the transverse waves along the wire changes by

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

A simple harmonic progressive wave is represented as

y = 0.03 s i n π (2 t - 0.01 x) m

. At a given instant of time, the phase difference between two particles

25 m

apart is

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The phase difference between the following two waves $y_{2}$ and $y_{1}$ is:

$y_{1} = a \sin (ω t - k x)$

$y_{2} = b \cos (ω t - k x + \frac{π}{3})$

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For a transvers wave travelling, along a straight line, the distance between two peaks (crests) is

5 m

, while the distance between one crest and one trough is

1.5 m

. The possible wavelengths (in

m

) of the waves are:

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Figure shows the symbolic representation of

Question Image

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

As the temperature increases, the electrical resistance

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Physics>Modern Physics>Electronics and Communication>Evolution of Electronics

Choose the correct statement. In conductors

What is the evolution of electronics?

Important Questions on Electronics and Communication

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