Author Question: A light emitting diode emits light of approximate wavelength 670 nm. What is the band gap? A) ... (Read 211 times)

bcretired · **on:** Jul 29, 2018

A light emitting diode emits light of approximate wavelength 670 nm. What is the band gap?

A)

1.86 eV
B)

4.14 eV
C)

1.80 eV
D)

3.72 eV
E)

2.70 eV

Question 2

Two long straight parallel lines of charge, 1 and 2, carry positive charge per unit lengths of 1 and 2, respectively. 1 > 2. The locus of points where the electric field is zero in this case is

A)

along a line between the lines closer to line 2 than line 1.
B)

at a point halfway between the lines.
C)

along line 1.
D)

along a line between the lines closer to line 1 than line 2.
E)

cannot be determined