1
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure). AIEEE 2008 Physics - Dual Nature of Radiation Question 143 English

Electrons accelerated by potential $$V$$ are diffracted from a crystal. If $$d = 1\mathop A\limits^ \circ $$ and $$i = {30^ \circ },\,\,\,V$$ should be about
$$\left( {h = 6.6 \times {{10}^{ - 34}}Js,{m_e} = 9.1 \times {{10}^{ - 31}}kg,\,e = 1.6 \times {{10}^{ - 19}}C} \right)$$

A
$$2000$$ $$V$$
B
$$50$$ $$V$$
C
$$500$$ $$V$$
D
$$1000$$ $$V$$
2
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure). AIEEE 2008 Physics - Dual Nature of Radiation Question 142 English

If a strong diffraction peak is observed when electrons are incident at an angle $$'i'$$ from the normal to the crystal planes with distance $$'d'$$ between them (see figure), de Broglie wavelength $${\lambda _{dB}}$$ of electrons can be calculated by the relationship ($$n$$ is an integer)

A
$$d\,\sin \,i = n{\lambda _{dB}}$$
B
$$2d\,\cos \,i = n{\lambda _{dB}}$$
C
$$2d\,\sin \,i = n{\lambda _{dB}}$$
D
$$d\,\cos \,i = n{\lambda _{dB}}$$
3
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
In the circuit below, $$A$$ and $$B$$ represent two inputs and $$C$$ represents the output. AIEEE 2008 Physics - Semiconductor Question 166 English

The circuit represents

A
NOR gate
B
AND gate
C
NAND gate
D
OR gate
4
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
A body is at rest at $$x=0.$$ At $$t=0,$$ it starts moving in the positive $$x$$-direction with a constant acceleration. At the same instant another body passes through $$x=0$$ moving in the positive $$x$$ direction with a constant speed. The position of the first body is given by $${x_1}\left( t \right)$$ after time $$'t';$$ and that of the second body by $${x_2}\left( t \right)$$ after the same time interval. Which of the following graphs correctly describes $$\left( {{x_1} - {x_2}} \right)$$ as a function of time $$'t'$$ ?
A
AIEEE 2008 Physics - Motion Question 149 English Option 1
B
AIEEE 2008 Physics - Motion Question 149 English Option 2
C
AIEEE 2008 Physics - Motion Question 149 English Option 3
D
AIEEE 2008 Physics - Motion Question 149 English Option 4
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