A material has an energy gap of 2.5 eV. What energy photons in the visible range (1.8 eV to 3.6 eV) would excite electrons into the conduction band?
A)
1.8 eV
B)
2.5 eV
C)
1.8 eV up to 2.5 eV
D)
2.5 eV up to 3.6 eV
E)
1.5 eV
D
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A low-luminosity star has a small and narrow ____, whereas a high-luminosity star has a large and wide one
a. UV range b. life capability c. habitable zone d. adaptable zone e. water hole
Which process is required to allow a gravitationally-collapsing gas cloud to continue to collapse?
A) The cloud must radiate away much of its thermal energy. B) The cloud must trap most of its thermal energy. C) The cloud must collide with other clouds. D) New dust particles must continually be made in the cloud.
Which one of the following quantities is at a maximum when an object in simple harmonic motion is at its maximum displacement?
a. speed c. kinetic energy b. acceleration d. frequency
Components: When Jeff ran up a hill at 7.0 m/s, the horizontal component of his velocity vector was 5.1 m/s. What was the vertical component of Jeff's velocity?
A. 4.8 m/s B. 4.3 m/s C. 3.8 m/s D. 3.4 m/s