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1 answer:
At room temperature oxygen, is present in the gas phase.
A gas is defined as a substance which is characterized by the rapidly movement of molecules which are widely separated. The shape and volume of gas is not definite that is they take on the shape of the container in which it is placed. The gas molecules have minimum inter-nuclear attractions and thus have high kinetic energy.
Thus, the sentences that describes oxygen at room temperature are:
- It has no definite volume and takes the shape of its container.
- Its particles move fast enough to overcome the attraction between them.
- It has more energy than it would be at a cooler temperature as the kinetic energy is directly proportional to the temperature that is kinetic energy increases on increasing the temperature.
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The kinetic energy of the emitted electrons of cesium when it is exposed to UV rays of frequency is
Further Explanation:
Photoelectric effect:
When light is made to fall on any substance, electrons are emitted from it. This is known as the photoelectric effect and the emitted electrons are called photoelectrons. The electrons are emitted because of the transference of energy from light to the electrons.
Cesium is a member of the alkali metal group so it is highly reactive and shows photoelectric effect to the maximum extent. It can remove its electron so easily because of its atomic size. Due to large atomic size of cesium, its outermost electrons are held very less tightly to the nucleus and therefore removed easily.
According to the Planck-Einstein equation, the energy is proportional to the frequency and is expressed as follows:
......(1)
Here,
is the energy.
is the Plank’s constant.
is the frequency.
The frequency of UV rays is or
The value of Planck’s constant is .
Substitute these values in equation (1)
But when electrons are ejected out from the surface of the substance, all of its energy is considered as kinetic energy.
So the kinetic energy of the electrons is .
Learn more:
1. Statement about subatomic particle: brainly.com/question/3176193
2. The energy of a photon in light: brainly.com/question/7590814
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Structure of the atom
Keywords: kinetic energy, frequency, energy, photoelectric effect, Planck's constant, light, electrons, photoelectrons, proportional, transference, reactive, cesium.