Vision Problems: Diego is nearsighted and cannot see things beyond 110 cm from his eyes. What is the focal length of the contact lenses that will enable him to comfortably see distant hills clearly?
A. +50 cm
B. -50 cm
C. -110 cm
D. +110 cm
E. -30 cm
Answer: C
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A) toward the Sun and disappears at perihelion. B) toward Earth and never varies. C) away from the Sun and disappears at perihelion. D) away from the Sun and becomes longest and brightest at perihelion. E) in the direction of the comet's motion.
Shell Radius: If a hydrogen atom originally in a state with principal quantum number n is excited to state n' = 2n, then
A. its radius and binding energy will double. B. its radius will quadruple and the binding energy will double. C. its radius will double and the binding energy will quadruple. D. its radius will quadruple and the binding energy will be reduced by a factor of four. E. its radius and binding energy will quadruple.
All the planets in the solar system have at least one moon
Indicate whether the statement is true or false
In a 2-dimensional Cartesian coordinate system the x component of a given vector is equal to that vector's magnitude multiplied by which trigonometric function, with respect to the angle between vector and y axis?
a. sine c. tangent b. cosine d. cotangent