Which of the following best describes the image for a thin, convex lens that forms whenever the object is at a distance less than one focal length from the lens?

a. upright, diminished, and virtual
c. upright, enlarged, and virtual
b. inverted, diminished, and real
d. inverted, enlarged, and real


C

Physics & Space Science

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In 1974 we transmitted a message toward the globular cluster M13 which is 21,000 ly away. What is one reason that this object was probably not ideal for sending a message to?

A) it is so far away that we will probably have stopped communicating before we receive and return signal B) globular clusters contain young, high mass stars with insufficiently long main sequence lifetimes and hence are unsuitable places for life C) the message will be absorbed by interstellar dust before it reaches the cluster D) globular clusters contain, old, low mass stars with fewer heavy elements and hence are not ideal places for life

Physics & Space Science

Atomic physics deals mainly with phenomena involving which particles in atoms?

a. Quarks b. Protons c. Electrons d. Neutrons

Physics & Space Science

The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of



a.
E.

b.
F.

c.
G.

d.
H.

e.
A.

Physics & Space Science

A triangle has sides of lengths 14 cm and 50 cm. If the triangle is a right triangle, which of the following could be the length of the third side?

a. 26 cm c. 48 cm b. 36 cm d. 64 cm

Physics & Space Science