A student observes a model of two bonded atoms. She is told that both atoms are nonmetals. Which of the following is a valid conclusion? A. The student is looking at a model of atoms held together by a covalent bond.

B. The student is looking at a model of a metalloid.

C. The student is looking at a model of a crystal lattice.

D. The student is looking at a model of atoms held together by an ionic bond.

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

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