At what distance must the object be placed on the principle axes in front of a concave mirror for the image to appear the same size as the object? Draw a ray diagram to illustrate your answer
The object must be placed at the radius of curvature.
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A hair is placed at one edge between two flat glass plates. When this arrangement is illuminated with yellow light of wavelength (l = 600 nm), a total of 61 dark bands are counted starting at the point of contact between the plates. How thick is the hair? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 3.6 × 10^-4 m c. 1.8 × 10^-5 m b. 1.8 × 10^-4 m d. 3.6 × 10^-5 m
In ultrasonic nondestructive testing with the pulse echo technique, a crack is detected by the _________ultrasonic waves.
Fill in the blank(s) with the appropriate word(s).
The solar energy coming to the earth by radiation is 1,340 W/m2 . If the sun has a radius of 7.000 x 108m, is a perfect radiator and is located 1.500 ? 1011m from the earth, then what is the temperature of the sun?
A. 6430 K B. 5760 K C. 4230 K D. 3670 K E. 3210 K
This large fuzzy blob in the center of this image is the central dominant galaxy of the cluster that surrounds it. The arrow points to several large clumps of stars near the center of the galaxy. What do those clumps probably represent?
A) Each clump was probably once the center of an individual galaxy. B) The clumps are regions of extremely strong x-ray emission. C) Each clump is the endpoint of one of the galaxy's spiral arms. D) The clumps are globular clusters orbiting the center of the galaxy.