A white dwarf cools slowly into a _________________ dwarf
Fill in the blank(s) with correct word
black
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An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. The observer is traveling at a velocity of 24.00 m/s toward the ambulance and the ambulance is traveling at a velocity of 24.00 m/s away the observer. What is the frequency of the siren perceived by the observer?
A. 2,448 Hz B. 2,424 Hz C. 2,400 Hz D. 2,376 Hz E. 2,352 Hz
The objective lens of a microscope has a focal length of 2.4 mm and the eyepiece has an angular magnification of 15. The object is positioned 0.060 mm beyond the focal point of the objective
The focal point of the eyepiece is positioned at the real image formed by the objective. The near point of the microscope user is at 25 cm. The magnitude of the overall magnification of the microscope is closest to A) 400. B) 450. C) 500. D) 550. E) 600.
In an ideal case rays coming from an object toward a lens or mirror should be reasonably close to the optical axis. To the extent that this condition is not completely met, which one of the following effects occurs?
a. mirages c. spherical aberration b. chromatic aberration d. light scattering
Which of the following increases the internal energy of a solid metal rod?
a. raising it to a greater height c. having the rod conduct heat b. throwing it through the air d. having the rod absorb heat