The table below gives the numbers of protons, electrons, and neutrons in four atoms. Atom
Number of protons
Number of neutrons
Number of electrons
1
19
19
18
12.
19
19
3
19
18
10
9
19
19
14
10
Based on the table, which atom has a charge of -1?
1
3
04
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Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.

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