ASSIGNMENTS COURSES
Assignment - 5. Quiz 1: Electric Charges to Transfer of Charges
Attempt 1 of 2
SECTION 1 OF 1
QUESTION
The flow of electrical charge from a battery differs from discharging a glass wand because:
The wand contains abundant free electrons, and the discharge period is long. The battery produces abundant charges, and the
discharge period is long
The wand contains relatively few free electrons, and the discharge period is long. The battery produces only a few charges, but the
discharge period is long.
The wand contains relatively few free electrons, and the discharge period is short. The battery produces abundant charges, and the
discharge period is long
no

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)

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Estimate of the number of stars in our galaxy