Stars and Galaxies (MindTap Course List)
10th Edition
ISBN: 9781337399944
Author: Michael A. Seeds
Publisher: Cengage Learning
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A proton, which is the nucleus of a hydrogen atom, can be modeled as a sphere with a diameter of 2.4 fm and a mass of 1.67 10-27 kg.Densities of Some Common Substances at Standard Temperature (0°C) and Pressure (Atmospheric)
Substance
ρ (kg/m3)
Substance
ρ (kg/m3)
Air
1.29
Iron
7.86 ✕ 103
Air (at 20°C andatmospheric pressure)
1.20
Lead
11.3 ✕ 103
Aluminum
2.70 ✕ 103
Mercury
13.6 ✕ 103
Benzene
0.879 ✕ 103
Nitrogen gas
1.25
Brass
8.4 ✕ 103
Oak
0.710 ✕ 103
Copper
8.92 ✕ 103
Osmium
22.6 ✕ 103
Ethyl alcohol
0.806 ✕ 103
Oxygen gas
1.43
Fresh water
1.00 ✕ 103
Pine
0.373 ✕ 103
Glycerin
1.26 ✕ 103
Platinum
21.4 ✕ 103
Gold
19.3 ✕ 103
Seawater
1.03 ✕ 103
Helium gas
1.79 ✕ 10−1
Silver
10.5 ✕ 103
Hydrogen gas
8.99 ✕ 10−2
Tin
7.30 ✕ 103
Ice
0.917 ✕ 103
Uranium
19.1 ✕ 103
(a) Determine the density of the proton.kg/m3
Why do you think that the energy level in the n- region is lower than the p-region?
How do the elements exhibit a range of band gaps?
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- What is the density in kg/m3 of the material in the nucleus of the hydrogen atom? The nucleus can be considered to be a sphere of radius 1.2 x 10-15 m, and its mass is 1.67 x 10-27 kg.arrow_forwardIt is relatively easy to strip the outer elections from a heavy atom like that of uranium (which then becomes a uranium ion), but it is very difficult to remove the inner electrons. Why do you suppose this is so?arrow_forwardThe hydrogen atom's nucleus is a proton (mass 1.7 x 1027 kg), outside of which there is a single electron (mass 9.1 x 10-31 kg) at an average separation distance (d) of 5.3 x 10-11 m. To solve for elecrtric force, use Coulomb's law, where electron charge q1 and the proton charge q2 have the same magnitude (1.6 x 10-19 C).arrow_forward
- What is the physical significance of hfg? Can it be obtained from a knowledge of hf and hg? How?arrow_forwardWhat is the magnitude of the electric field at a distance of 0.1 nm from a thorium nucleus? I have tried 2.304E-8 and 2.07E-6 and they are both wrongarrow_forwardSolar wind is a flow of heavily charged ions emanating from the Sun’s corona. Spectroscopic analysis suggests it contains a density of approximately 5.0 electrons per cubic centimeter (cm3). Given that the elementary charge ? ≈ 1.6 × 10−19 ? and using the combined average of your measured values of Q, determine the charge density of a cubic meter (m3) of solar wind sample as a function of Qarrow_forward
- How far does the electron of a hydrogen atom have to be removed from the nucleus for the force of attraction equal to the weight of the electron at the surface of the earth? PLEASE WRITE NICELY DONT TYPEarrow_forwardSuppose someone wanted to build a scale model of the atom with a nucleus 1.4 m in diameter. How far away would the nearest electron need to be in meters? Assume the orbital radius of an electron is 10^(-10)m, while the radius of the nucleus is 10^15 m. ra=?arrow_forwardIn the planetary model of the atom where electrons orbit a centralized nucleus, what is the approximate ratio of the radius of the nucleus to that of the electron orbits?arrow_forward
- Is the number of protons present inside the nucleus is equal to the number of electrons outside the nucleus of an atom? True or False?arrow_forwardSay that the surface of a star has a temperature of 6000 K and an electron density of n = 2.6 x 1019 electrons per m3. Using the Saha equation, what fraction of hydrogen atoms is ionized?arrow_forward
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