The $I - V$ characteristic of an LED is

A diode detector is used to detect an amplitude modulated wave of

60%

modulation by using a condenser of capacity

250 pF

in parallel with a load resistance

100 k Ω

. Find the maximum modulated frequency which could be detected by it. (a)

10.62 MHz

10.62 kHz

5.31 MHz

5.31 kHz

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2013

View solution

This question has Statement I and Statement II. Of the four choices given after the statements, choose the one that best describes the two statements.
Statement I: Higher the range, greater is the resistance of ammeter.
Statement II: To increase the range of ammeter, additional shunt needs to be used across it.
(a) Statement I is true, Statement II is true; Statement II is the correct explanation of Statement I
(b) Statement I is true, Statement II is true; Statement II is not the correct explanation of Statement I
(c) Statement I is true, Statement II is false
(d) Statement I is false, Statement II is true

Topic:

Current Electricity

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2013

View solution

In a hydrogen like atom electron make transition from an energy level with quantum number

n

to another with quantum number

(n - 1)

. If

n ≫ 1

, the frequency of radiation emitted is proportional to
(a)

\frac{1}{n}

\frac{1}{n ^{2}}

\frac{1}{n ^{3} /2}

\frac{1}{n ^{3}}

Topic:

Atoms

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2013

View 5 solutions

is uniformly distributed over a long rod

A charge

Q

A B

of length

L

as shown in the figure. The electric potential at the point

O

lying at distance

L

from the end

A

is

(a)

\frac{Q}{8 π ε _{0} L}

\frac{3 Q}{4 π ε _{0} L}

\frac{Q}{4 π ε _{0} L l n 2}

\frac{Q l n 2}{4 π ε _{0} L}

Topic:

Electric Charges and Fields

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2013

View 10 solutions

Practice questions from Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

An amplitude modulates signal is given by

v (t) = 10 [1 + 0.3 cos (2.2 \times 1 0^{4} t)] sin (5.5 \times 1 0^{5} t)

. Here,

t

is in seconds. The sideband frequencies (in

kHz

) are

(

Take,

π = \frac{22}{7})

(a)

892.5

857.5

89.25

85.75

178.5

171.5

(d) 1785 and 1715

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

View 4 solutions

In the following, which one of the diodes is reverse biased?

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2006

View 3 solutions

, for the given logic gate circuit, the input values must be

To get output ' 1 ' at

R

$X = 0, Y = 0$
$X = 1, Y = 0$
$X = 1, Y = 1$
$X = 0, Y = 1$

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

View 2 solutions

Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If for an

n

- type semiconductor, the density of electrons is

1 0^{19} m^{- 3}

and their mobility is

1.6 m^{2} (V - s)

, then the resistivity of the semiconductor (since, it is an

n

-type semiconductor contribution of holes is ignored) is close to (a)

2 Ω - m

0.2 Ω - m

0.4 Ω - m

4 Ω - m

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

View 4 solutions

Practice questions from Semiconductor Electronics: Materials, Devices and Simple Circuits in the same exam

The modulation frequency of an AM radio station is

250 kHz

, which is

10%

of the carrier wave. If another AM station approaches you for license, what broadcast frequency will you allot? (a)

2000 kHz

2250 kHz

2900 kHz

2750 kHz

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

View 9 solutions

LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is

1.9 eV .

Calculate the wavelength of light emitted and its colour.

[h = 6.63 \times 1 0^{- 34} Js

c = 3 \times 1 0^{8} ms^{- 1}]

$654 nm$ and red colour
$1046 nm$ and blue colour
$1046 nm$ and red colour
$654 nm$ and orange colour

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Exam:

JEE Mains 2021 Feb 26 Shift 1

View 3 solutions

of AND gate for the following inputs

The output waveform

(Y)

A

B

given below is

( a )
( b )
( c )
( d )

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2008

View solution

The output of the given logic circuit is

$A \overline{B}$
$\overline{A} B$
$A B + \overline{A B}$
$A \overline{B} + \overline{A} B$

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam:

JEE Mains 2019

View 3 solutions

Practice more questions from Semiconductor Electronics: Materials, Devices and Simple Circuits

In the figure below, is the diode

D

forward or reverse biased?

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

View solution

Identify the mathematical expression for amplitude modulated wave

$A_{c} sin [{ω_{c} + k_{1} v_{m} (t)} t + ϕ]$
$A_{c} sin {ω_{c} t + ϕ + k_{2} v_{m} (t)}$
${A_{c} + k_{2} v_{m} (t)} sin (ω_{c} t + ϕ)$
$A_{c} v_{m} (t) sin (ω_{c} t + ϕ)$

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Master Resource Book in JEE Main Physics (Arihant)

View 2 solutions

PN-junction diode works as a insulator, if connected :

To A.C.
In forward bias
In reverse bias
None of these

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Fundamentals of Physics, Extended

View solution

α

of a transistor is

0.95

, then,

β

Topic:

Semiconductor Electronics: Materials, Devices and Simple Circuits

Book:

Master Resource Book in JEE Main Physics (Arihant)

View solution

Practice questions on similar concepts asked by Filo students

. In a certain thermodynamical process, the pressure of a

2. respectively]

D = k

p = k

the temperature changes from

10 0^{\circ} C

30 0^{\circ} C

will be

$k v^{3}$ av $200. n R$ , where $n$ denotes number of moles of a gas.
24. A small bob tied at one end of a thin string of length $1 m$
is describing a vertical circle, so that the maximum and
30. The potential er? minimum tension in the string are in the ratio $5 : 1$ . The function depend velocity of the bob at the highest position 1 - $5 : 1$ . The

Topic:

Mechanics

View solution

An electric dipole has a fixed dipole moment

?

p

, which makes angle

θ

with respect to

x

-axis. When subjected to an electric field

E_{1} = E \hat{θ}

, it experiences a torque

T_{1}

= τ \hat{k}

. When subjected to another electric field

E_{2} = 3 E j

, it experiences torque

T_{2}

= - T_{1}

. The angle

θ

is: Torque experienced by the dipole

p = p cos θ \overset{}{^} + p sin θ \hat{j}

in an electric field

τ_{net} = p \times E E_{1} = E  \Rightarrow T_{1} = p \times E_{1} = (p cos θ  + p sin θ)) \times Et \Rightarrow τ \hat{k} = pE sin θ (- \hat{k}) τ \hat{k} = pE sin θ (- \hat{k})

E_{2} = 3 E \overset{}{^} \Rightarrow T_{2} = p \times E_{2} = (p cos θ \hat{i} + p sin θ)) \times 3 E \overset{}{^} \Rightarrow - τ \hat{k} = 3 pE cos θ \hat{k} τ \hat{k} = 3 pE cos θ (- \hat{k})

From

τ \hat{k} = pE sin θ (- \hat{k})

τ κ = 3 pE cos θ (- κ)

pE sin θ = 3 pE cos θ

tan θ = 3

θ = 6 0^{\circ}

Topic:

Electrostats

View solution

be rotated, so that the light ray after reflection from both the mirrors become horizontal.

9. By what angle should

M_{2}

Topic:

Optics

View 3 solutions