The objective and the eyepiece of a microscope have focal lengths of 4.00 mm and 25.0 mm, respectively. The objective produces a real image 30 times the size of the object
The final image is viewed at infinity, and the near point of the microscope user is at 25.0 cm. What is the distance between the object and the focal point of the objective?
A) 0.13 mm
B) 0.18 mm
C) 0.23 mm
D) 0.28 mm
E) 0.33 mm
A
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Two water waves, call them X and Y, have the same amplitude but different wavelengths: X has a longer wavelength than Y. Regarding their frequencies and their energies,
A) X has the larger (higher) frequency and carries the greater energy. B) Y has the larger frequency and X carries the greater energy. C) Y has the larger frequency and carries the greater energy. D) X has the larger frequency and Y carries the greater energy. E) Y has the larger frequency and the two waves carry the same energy.
Force on a Wire: A thin copper rod 1.0 m long has a mass of 0.050 kg and is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to balance the weight of the rod?
A. 1.2 A B. 2.5 A C. 4.9 A D. 9.8 A
Star A and star B have the same temperature, but star A is 5 times bigger than star B. Which statement below is correct?
A) Star A is redder and dimmer than star B. B) Star A is bluer and dimmer than star B. C) Star A is redder and brighter than star B. D) Star A is bluer and brighter than star B. E) Star A and star B have the same color, but star A is brighter.
According to the reanalysis of the Apollo seismic data in 2011, what is the structure of the lunar interior?
What will be an ideal response?