Radon is the heaviest naturally radioactive ________________ gas. A) noble B) halogen C) group 1 D) diatomic
2 answers:
Answer: A) noble
Explanation:
Noble gases are group 18 elements which have completely filled valence shell. thus they do not lose or gain electrons and are called as nonreactive or noble.
Electron configuration of radon is:
Halogens are group 17 elements and have a valency of 1 as they can gain one electron to attain stable configuration.
Group 1 elements are alkali metals which have a valency of 1 as they can lose their outermost electron to attain stable configuration.
Diatomic means the molecule contains two atoms in one molecule.
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Answer:
The frequency is the same
Explanation:
When a wave is created by a source which is vibrating at a certain frequency, the frequency of the wave itself is equal to the frequency of the source.
This occurs with every kind of wave. For instance, if we consider the radio waves produced by an antenna, the frequency of the radio waves is equal to the frequency of the antenna.
In this case, the waves are created by the vibrating bug. The bug is vibrating with a certain frequency : as a consequence, the frequency
of the waves produced by the bug will be equal to the frequency of vibration of the bug:
.
Answer:
a. 572Btu/s
b.0.1483Btu/s.R
Explanation:
a.Assume a steady state operation, KE and PE are both neglected and fluids properties are constant.
From table A-3E, the specific heat of water is , and the steam properties as, A-4E:
Using the energy balance for the system:
Hence, the rate of heat transfer in the heat exchanger is 572Btu/s
b. Heat gained by the water is equal to the heat lost by the condensing steam.
-The rate of steam condensation is expressed as:
Entropy generation in the heat exchanger could be defined using the entropy balance on the system:
Hence,the rate of entropy generation in the heat exchanger. is 0.1483Btu/s.R