A Proton Moving at 6

question 35

Multiple Choice

A proton moving at 6.0 × 10⁴ m/s is projected at an angle of 30° above a horizontal plane.If an electric field of 400 N/C is acting down,how long does it take the proton to return to the horizontal plane? (Hint: Ignore gravity.m_proton = 1.67 × 10−²⁷ kg,q_proton = 1.6 × 10−¹⁹ C)

• A) 7.8 × 10−⁶ s
• B) 1.6 × 10−⁶ s
• C) 7.8 × 10−⁷ s
• D) 3.9 × 10−⁶ s

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Definitions:

Cornea

The transparent front part of the eye that covers the iris, pupil, and anterior chamber, responsible for focusing most of the light that enters the eye.

Pupil

The opening in the center of the iris of the eye, through which light enters and is regulated in size to control the amount of light that enters.

Optic Nerve

The nerve that transmits visual information from the retina to the brain.

Fovea

A small depression in the retina of the eye where visual acuity is highest, due to the concentration of cone cells.