In a 35.0-mm single lens reflex camera (SLR), the distance from the lens to the film is varied in order to focus on objects at varying distances
Over what distance range must a lens of 55-mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to 0.60 m from the camera? A) 5.55 mm
B) 4.44 mm
C) 16.7 mm
D) 22.2 mm
E) 7.77 mm
A
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The electrical resistivity of tantalum (Ta) at temperatures approaching 0 K is 1×10-8 ?·m, and at 150K it is 7×10-8 ?·m. Analytically predict the electrical resistivity of Ta at 295 K.
What will be an ideal response?
What are constellations?
A) groups of galaxies gravitationally bound and close together in the sky B) groups of stars making an apparent pattern in the celestial sphere C) groups of stars gravitationally bound and appearing close together in the sky D) ancient story boards, useless to modern astronomers E) apparent groupings of stars and planets visible on a given evening
Which of the following is one of the sources of the atmospheric ozone problem?
A) coal-fired generating plants B) cutting down forests C) certain types of air-conditioner coolant D) nuclear power plants E) All of the above.
The ground state is the lowest energy level in an atom
a. True b. False Indicate whether the statement is true or false