Is it accurate to describe the physical universe as composed of only matter and energy?

2 answers:

7 0

Yes, it is accurate to describe the physical universe as composed of only matter and energy. Some people might argue about the dark matter, but it is not yet defined properly. Different universes can be made up of different compositions but it is a fact that our universe is made of matter and energy.

serious [3.7K]3 years ago

3 0

Answer:

Explanation:

Universe is composed matter, anti-matter, energy and dark-energy. Only 5% of the universe is made of matter and energy. Rest of the universe is composed of dark matter and dark energy about which we are yet to be clearly understood scientifically. From Einstein's equation, we understand matter and energy are related as: E = m c².

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ivann1987 [24]

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If a seismic wave has a period of 0.0202s, find the frequency of the wave.

maw [93]

Answer:

49.5 Hz.

Explanation:

From the question given above, the following data were obtained:

Period (T) = 0.0202 s

Frequency (f) =?

The frequency and period of a wave are related according to the following equation:

Frequency (f) = 1 / period (T)

f = 1/T

With the above formula, we can obtain the frequency of the wave as follow:

Period (T) = 0.0202 s

Frequency (f) =?

f = 1/T

f = 1/0.0202

f = 49.5 Hz

Therefore the frequency of the wave is 49.5 Hz.

7 0

3 years ago

Define the focus of a concave lens

Sophie [7]

Answer:

Principal focus of concave lens - 

★ The point at which rays parallel to principal axis coming from infinity appear to converge after being refracted from concave lens is called the principal focus of concave lens.

________________________

• Additional information - 

★ Principal focus - A number of rays parallel to the principal axis after reflection from a concave mirror meet at a point on the principal axis or appear to come from a point after reflection from a convex mirror on the principal axis. This is called principal focus.