The electrical conductivity of a(n) _________semiconductor is the same as the electrical conductivity of a pure semiconductor.
Fill in the blank(s) with the appropriate word(s).
intrinsic
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Material 1 has Young's modulus Y1 and density ?1, and material 2 has Young's modulus Y2 and density ?2 . If Y1 is 30% more than Y2 and ?1 is 30% less than ?2, which material has the higher speed of sound and how much higher is it?
a. Material 1 has a speed of sound more than 35% higher than material 2 b. Material 1 has a speed of sound 30% higher than material 2. c. Material 2 has a speed of sound more than 80% higher than material 1 d. Material 2 has a speed of sound 30% higher than material 1.
According to Einstein's special theory of relativity, when compared to an identical clock at rest, a clock moving with constant velocity will run
(a) Slow (b) Fast (c) At the same rate (d) Alternately fast and slow
A particle initially moving with a velocity 2 m/s experiences a constant acceleration of 1 m/s2 in the +x-direction and -2 m/s2 in the y-direction. What are the velocity components of the particle after 4 s?
What will be an ideal response?
How do scientists study the history of life on Earth?
A) by comparing present-day organisms with each other, and assuming past life had mixed traits of present-day organisms B) by assuming that life in the past was just like present-day life C) by using telescopes to look far away, and thus see what life was like in the past D) by studying fossils, the preserved remains of past organisms