The term business cycle refers to economy-wide fluctuations in production, trade, and general economic activity. Identify features of the economic business cycle. Business cycles are identified as having four distinct phases: expansion, peak, contraction, and trough. An expansion is characterized by increasing employment, economic growth, and upward pressure on prices.
The speed of light in a given material is related to a quantity called the index of refraction, n, which is defined as the ratio of the speed of light in vacuum to the speed of light in the medium: index of refraction: n = c / v.When light travels from one medium to another, the speed changes, as does the wavelength.efraction. When we talk about the speed of light, we're usually talking about the speed of light in a vacuum, which is 3.00 x 10 8 m/s. When light travels through something else, such as glass, diamond, or plastic, it travels at a different speed.
The metre is the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second. This defines the speed of light in vacuum to be exactly 299,792,458 m/s. Unfortunately it doesn't mention anything about inertial frames, but you can consider a measurement in an inertial frame to be implied. However, this is not the end of the matter. The SI is based on very practical considerations.