An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the observer is traveling at a velocity of 24.00 m/s toward the stationary ambulance, then what is the frequency of the siren perceived by the observer?
A. 2,640 Hz
B. 2,567 Hz
C. 2,520 Hz
D. 2,508 Hz
E. 2,475 Hz
B. 2,567 Hz
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The peak of the radiation curve of a blackbody moves upward toward higher intensity as its temperature __________
Fill in the blank(s) with correct word
Unlike the ultraviolet photons originally emitted by the embedded stars of an emission nebula, the photons emitted by the recombination of electrons with atoms:
A) do not escape the nebula. B) escape the nebula. C) are re-absorbed by neutral hydrogen atoms. D) bounce around inside the nebula. E) are scattered by the dust particles.
Four identical particles (mass of each = 0.24 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the center of mass of the body and is parallel to the shorter sides of the rectangle?
a. 2.4 kg/m2 b. 2.2 kg/m2 c. 1.9 kg/m2 d. 2.7 kg/m2 e. 8.6 kg/m2
The first solenoid has 2 times the diameter, 2 times the number of turns, and 2 times the length of the second solenoid. Which solenoid has the greater inductance and by what factor?
a. the first solenoid by a factor of 8 c. the first solenoid by a factor of 16 b. the second solenoid by a factor of 8 d. the second solenoid by a factor of 32