A compound microscope has an eyepiece that:
a. uses a real image from the objective as the object and forms a virtual image.
b. uses a virtual image from the objective as the object and forms its own virtual image.
c. uses a real image from the objective as the object and forms its own real image.
d. uses a virtual image from the objective as the object and forms its own real image.
A
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Two equal-sized buckets are brim-filled with water, one with a piece of floating wood and the other without. If the buckets are put on a weighing scale, the heavier one is
A) the bucket with the floating wood. B) the bucket without the wood in it. C) either, for the weights of both are the same.
In a 35 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 range must a lens of 45 mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to 1.4 m from the camera? A) 1.49 mm B) 1.20 mm C) 4.48 mm D) 5.98 mm E) 2.09 mm
Water solutions of which of the following are basic?
a. Soft drinks b. Baking soda c. Lemonade d. Vinegar
The oxygen molecule (O2) may be regarded as two masses connected by a spring. In vibrational motion, each oxygen atom alternately approaches, then moves away from the center of mass of the system. If each oxygen atom of mass m = 2.67 × 10^-26 kg has a vibrational energy of 6.4 × 10^-21 J and the effective spring constant is 50 N/m, then what is the amplitude of oscillation of each oxygen atom?
a. 3.2 × 10^-11 m c. 1.1 × 10^-11 m b. 1.6 × 10^-11 m d. 8.0 × 10^-12 m