Which of the following statements is true of a Doppler shift?
A) A light source approaching an observer will appear red.
B) A light source moving away from an observer will appear blue.
C) The shift in the velocity of the source is identified irrespective of its direction.
D) The amount of change in wavelength depends on the speed of the source.
D
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An auto moves 10 meters in the first second of travel, 15 more meters in the next second, and 20 more meters during the third second. The acceleration of the auto is
A. 5 m/s2. B. zero m/s2. C. 9.8 m/s2. D. 3.33 m/s2. E. 30 m/s2.
What is the magnification of a telescope and eyepiece if the telescope objective has a focal length of 200 cm and the eyepiece has a focal length of 2.0 cm
a. 400 times b. 4000 times c. 100 times d. 1000 times e. 40 times
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with
the eyepiece adjusted for minimum eyestrain. The near-point distance of the person using the microscope is 25.0 cm. What is the final magnification of the microscope? A) -190 B) -240 C) -300 D) -310 E) -470
If you toss a coin straight upward in train that gains speed while the coin is in the air, the coin will land
A) as if you were at rest. B) in front of you. C) in back of you.