Which statement about thin lenses is correct? In each case, we are considering only a single lens
A) A converging lens always produces a real inverted image.
B) A diverging lens always produces a virtual inverted image.
C) A converging lens sometimes produces a real erect image.
D) A diverging lens always produces a virtual erect image.
E) A diverging lens produces a virtual erect image only if the object is located within the focal point of the lens.
D
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A positively charged particle is moving in the +y-direction when it enters a region with a uniform electric field pointing in the +x-direction. Which of the diagrams below shows its path while it is in the region where the electric field exists. The region with the field is the region between the plates bounding each figure. The field lines always point to the right. The
x-direction is to the right; the y-direction is up.
a.
b.
c.
When a force is applied to an object the work done is
A. Negative B. Positive C. There is no work D. All of these are possible
Waves on a String: Crests of an ocean wave pass a pier every 10.0 s. If the waves are moving at 5.6 m/s, what is the wavelength of the ocean waves?
A. 56 m B. 28 m C. 64 m D. 48 m
If you triple the rms voltage in an ac circuit, what happens to the maximum voltage?
A) It increases by a factor of . B) It decreases by a factor of . C) It decreases by a factor of 3. D) It increases by a factor of 3. E) It increases by a factor of 9.