Red-colored diode lasers for pointers and surveying are made from pnjunctions of the compound semiconductor GaAs that has an energy gap of 1.42 eV. What is the wavelength of the light from a GaAs laser?
What will be an ideal response?
The energy gap for GaAs is 1.42 eV, and the electrons in the conduction band decay into the valence band to create photons of energy equal in magnitude to the energy gap.
You might also like to view...
What is the name of the path on the celestial sphere that goes through the constellations of the zodiac?
A) the celestial equator B) the ecliptic C) the Milky Way D) the meridian E) the horizon
Rotational Kinetic Energy: A small uniform disk and a small uniform sphere are released simultaneously at the top of a high inclined plane, and they roll down without slipping. Which one will reach the bottom first?
A. the one of smallest diameter B. the one of greatest mass C. the disk D. the sphere E. They will reach the bottom at the same time.
A rigid rod of length l rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following are equal at all points on the rod? I. the angular position II. the angular velocity III. the angular acceleration IV. the centripetal acceleration V. the tangential acceleration
a. I and II b. I, II, and III c. I, II, III and IV d. I, II, III, IV and V e. I, II and IV.
A proton travels through a potential of 1.0 kV and then moves into a magnetic field of 0.040 T. What is the radius of the proton's resulting orbit?
A) 0.080 m B) 0.11 m C) 0.14 m D) 0.17 m E) 0.19 m