The Rydberg formula was formulated by Johannes Rydberg for the calculation of the wavelength of an atomic element when an excited electron moves from the quantum shells. The formula is
1/wavelength=R(1/n1^2 - 1/n2^2), where n2 and n1 are the principal quantum numbers and R is the Rydberg constant which is equal to 1.097 x 107<span> m</span><span>−1.
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As mentioned, the electron moves from an excited state n2, to the ground-level state n1. Therefore, n2 is always greater than n1. Substituting the values to the equation:
1/wavelength=1.097 x 10^7 (1/2^2 - 1/4^2)
wavelength = 4.8617 meters or 48.6 micrometers
Answer:
B). the temperature of B increases more than the temperature of A
Explanation:
For constant volume process, relation between molar heat capacity and temperature is given by,
where, ΔQ is the amount of heat required
m is the mass of the gas
is heat capacity at constant volume
ΔT is the change in temperature.
For a constant energy ΔQ,
Given,
∴
Thus the temperature of gas B increases more than the temperature of gas A.
Thermal energy
Uneven distribution of thermal energy
Water vapor in the atmosphere
Explanation
Resonance:
1. The amplitude of vibration is very large.
2. The vibrations of the body are in phase with the external periodic force.
Forced Vibrations:
1. The amplitude of vibration is usually small.
2. The vibrations of the body are not in phase with the external periodic force.