The given graph represents V - I characteristic for a semiconductor device. Which of the following statement is correct?

It is V - I characteristic for solar cell where, point A represents open circuit voltage and point B short circuit current

It is for a solar cell and points A and B represent open circuit voltage and current, respectively

It is for a photodiode and points A and B represent open circuit voltage and current respectively

It is for a LED and points A and B represent open circuit voltage and short circuit current, respectively

EASY

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What is direct and indirect bandgap?

Important Questions on Solids

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

LED is constructed from

G a - A s - 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 10^{- 34} J - s

and

c = 3 \times 10^{8} m s^{- 1}

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

The

I - V

characteristics of an

LED

is:

MEDIUM

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

The given graph represents

V

I

characteristic for a semiconductor device.
Question Image

Which of the following statement is correct?

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

Two $p$ - $n$ photodiodes are fabricated from semiconductors with band gap of $2.8 eV$ and $2.6 eV,$ respectively.

Choose the correct statement from the following.

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

What is LED? Mention two of its applications.

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

The band gap of the semiconductor

{GaAs}_{0.6} P_{0.4}

1.9 eV

. If this material is used to make a Light Emitting Diode

(LED)

, the colour of the emerging light will appear

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

Photodiode is a device

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

Identify the incorrect statement:

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

Write the name of any one dopped semiconductor used for making light emitting diode (LED).

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

LED emits light when connected in _____.

(Fill in the blank using 'forward bias' or 'reverse bias')

MEDIUM

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

Why cannot we use

Si

and

Ge

in fabrication of visible LEDs ?

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

A light emitting diode is

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

An LED is constructed from a

p - n

junction based on a certain semiconducting material whose energy gap is

1.9 eV

. Then, the wavelength of the emitted light is,

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

The

I V

characteristic of an LED is,

HARD

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

The V-I characteristics of LED is similar to the characteristics of

HARD

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

What do you understand by light-emitting diode (LED)? Explain photodiode and distinguish LED and photodiode. Draw their biasing also.

HARD

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

Statement-1 : Light emiting diode (LED) emit spontaneous radiation.

Statement-2 : LED are forward-biased p-n junction.

EASY

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

State any four applications of LED's,

HARD

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

What is LED? Explain how radiations are given out by LED?

HARD

Physics>Modern Physics>Solids>Special Purpose P-N Junction Diode

What is a light-emitting diode?

What is direct and indirect bandgap?

Important Questions on Solids

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