A group of eras are called a(n)

a. eon.
b. period.
c. millennia.
d. epoch.


a

Physics & Space Science

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What is the energy, in eV, of a photon of wavelength 550. nm?

What will be an ideal response?

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Tricia puts 5.30 g of dry ice (solid CO2) into a 4.00-L container and seals the top. The dry ice turns to gas at room temperature (20.0°C). Find the pressure increase in the 4.00-L container. (One mole of CO2 has a mass of 5.30 g, R = 0.082 1 L/atm/mol/K. Ignore the initial volume of the dry ice.)

a. 24.0 atm b. 6.01 atm c. 0.318 atm d. 11.2 atm e. 2.17 atm

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A nonconducting sphere contains positive charge distributed uniformly throughout its volume. Which statements about the potential due to this sphere are true? All potentials are measured relative to infinity

(There may be more than one correct choice.) A) The potential is highest at the center of the sphere. B) The potential at the center of the sphere is zero. C) The potential at the center of the sphere is the same as the potential at the surface. D) The potential at the surface is higher than the potential at the center. E) The potential at the center is the same as the potential at infinity.

Physics & Space Science

When the isotope bismuth-213 emits an alpha particle, what new element results?

A) lead B) platinum C) polonium D) thallium

Physics & Space Science