In the following equation what is Ry?

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Question restatement: The problem asks, 'In the following equation what is Ry?' The equation given is E_n = - R_y (1/n^2), which uses the Rydberg constant in energy units.

Option 1: 'the speed of light: 3.0 × 10^8 m/s' - This is unrelated to the Rydberg constant in this context. The speed of light appears in other formulas (like E = hc/λ), but it is not what R_y represents in the energy expression given.

Option 2: 'the number of photons' - The Rydberg constant is a fixed physical constant; it does not count photons. This choice confuses a constant with a quantum count.

Option 3: 'the principal quantum number' - n is the principal quantum number in the energy level formula, but the symbol here is R_y, not n. This option confuses the variable used for energy levels with the constant.

Option 4: 'a constant that is equal to 2.18 × 10–18 J' - This aligns with the energy form of the Rydberg constant, often denoted R_y, representing the Rydberg energy. In the expression E_n = - R_y (1/n^2), R_y is indeed the energy constant in joules, so this matches the given equation.

Option 5: 'the energy of the electron in an orbit' - While E_n gives the energy of the nth level, R_y is a constant, not the energy itself. The energy of a specific level results from applying R_y and n, not R_y alone.

Option 6: 'the Rydberg constant: 1.097 × 10^7 m–1' - This value corresponds to the Rydberg constant in units of inverse meters, R∞, used when energies are expressed via wavelength or wavenumber. It is related but not the same quantity as R_y in joules, which the given equation uses. This option describes a different form of the Rydberg constant.

Summary: Among the options, the one that matches the provided equation En = -R_y(1/n^2) is the constant equal to 2.18 × 10–18 J, since R_y here is the Rydberg energy in joules. The other choices either describe unrelated constants, misinterpret the symbol, or refer to a different unit form of the Rydberg constant.

CHEM 110 Section 3 (PM) SP25 Pre-Lecture 6 Quiz C02-1-3

In the following equation what is Ry?

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