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Radiation is the emission or transmission of energy through a material medium or across space in the form of waves or particles. This comprises:
- Electromagnetic radiation: Such as microwaves, radio waves, x-rays, infrared, ultraviolet, visible light, and gamma radiation.
- Particle radiation: Such as proton radiation, alpha radiation, beta radiation (β), and neutron radiation.
- Acoustic radiation: Such as sound, ultrasound, and seismic waves.
- Gravitational radiation: In the form of gravitational waves or ripples in the curvature of spacetime
The two primary categories of radiation that may be found in nature, according to the energy of the particle released, are:
- Ionizing Radiation: Ionizing radiation consists of subatomic particles or electromagnetic waves with enough energy to ionize atoms or molecules by detaching their electrons. This type of radiation includes nuclear radiation.
- Non-Ionizing Radiation: Any electromagnetic radiation that does not contain enough photon energy per quantum to ionize atoms or molecules i.e. to entirely remove an electron from an atom or molecule is referred to as non-ionizing radiation.
Very Short Answers Questions [1 Mark Questions]
Ques. Which of the following is an example of electromagnetic radiation?
- Seismic waves
- X-rays
- Neutron radiation
- Alpha rays
Ans. The correct answer is b. X-rays
Explanation: X-rays, often known as X-radiation, are a type of electromagnetic radiation with an extremely short wavelength and a high frequency. Its wavelength varies between 10-8 and 10-12 m.
Ques. Ultrasound is a
- Gravitational radiation
- Particle Radiation
- Electromagnetic radiation
- Acoustic Radiation
Ans. The correct answer is d. Acoustic Radiation
Explanation: Acoustic radiation is a physical phenomenon caused by the interaction of an acoustic wave with an obstruction along its path.
Ques. Atoms with unstable nuclei are said to be
- Radioactive
- Non-radioactive
- Partially radioactive
- None of the above
Ans. The correct answer is a. Radioactive
Explanation: Radioactivity refers to the ability of some elements to spontaneously produce energy in the form of radiation due to the disintegration of an unstable atom.
Ques. Is radiation associated with hair loss and thyroid functioning?
- True
- False
Ans. The correct answer is a. True
Explanation: Radiation is associated with hair loss and thyroid function. Hair loss occurs when the radiation exposure exceeds 200 rems. The presence of too much radioactive iodine damages the thyroid gland.
Ques. The mechanical pressure applied upon any surface, which occurs due to the interchange of momentum between the electromagnetic field and the object is known as
- Momentum pressure
- Pressure gauge
- Radiation pressure
- Electromagnetic pressure
Ans. The correct answer is c. Radiation pressure
Explanation: The mechanical pressure that is applied to any surface as a result of the exchange of momentum between an object and the electromagnetic field is referred to as radiation pressure (also known as light pressure).
Short Answers Questions [2 Marks Questions]
Ques. What is Radiation?
Ans. Radiation is defined as the transfer of energy or particles from a source through space or other media. Radiation includes light, heat, microwaves, and radio waves utilized in wireless communications.
Ques. Where does Radiation come from?
Ans. There are both natural and man-made sources of radiation in our environment, which has existed from the beginning of time, but radiation may also be created intentionally, such as in medical x-rays and microwave ovens for cooking.
Ques. Why do the alpha, beta, and gamma radiations come out of a radioactive substance spontaneously?
Ans. This is due to the fact that alpha and beta radiations contain matter, but gamma rays are bursts of energy. The type of radiation released is determined by the radioactive material. An alpha particle is made up of two protons and two neutrons that bond together, whereas beta particles are made up of high-energy electrons. Gamma rays are electromagnetic energy waves, also known as photons.
Ques. What is a Radiation Detector?
Ans. A radiation detector is a device that detects different wavelengths of radiation. These radiation detectors are extremely beneficial for persons who operate in highly radiated environments. They may keep safe by being aware of the radiation surrounding them and utilizing this equipment.
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Long Answers Questions [3 Marks Questions]
Ques. What are the four laws of radiation?
Ans. The following are the four laws of radiation
- Kirchoff’s Law: The ratio of emissive power to absorptive power of a blackbody at a certain temperature is constant and equal to the emissive power of a blackbody at the same temperature.
- Planck's Law: It states that the total electromagnetic radiation emitted by a body is not released continuously but is composed of discrete units or quanta of energy.
- Stefan-Boltzmann Law: The total radiant energy radiated by a body is proportional to the fourth power of the absolute temperature.
- Wein’s Displacement Law: It states that for different temperatures, the blackbody radiation curve will have distinct peaks at different wavelengths that are inversely proportional to temperature.
Ques. What are the properties of Thermal Radiation?
Ans. The following are the properties of thermal radiation
- Thermal radiation is the transfer of heat by electromagnetic radiation caused by the thermal motion of matter particles.
- Thermal radiation, unlike conduction and convection, does not require a medium to transport heat.
- The Earth receives the heat from the sun through radiation. This is due to the fact that radiation occurs through electromagnetic waves, which do not require a medium for transmission.
Ques. What are the important characteristics of electromagnetic radiation?
Ans. The following are the characteristics of electromagnetic radiation
- Wavelength: Wavelength is defined as the distance between identical points or crests, i.e., the distance between the top of one crest and the top of the next.
- Velocity: Velocity is the product of wavelength and frequency and is always expressed as 3 x 108 m/s.
- Frequency: The frequency of a wave is the number of times it passes through a point in a given unit of time.
- Amplitude: The amplitude of a wave is defined as the distance between its highest and lowest points.
- Time period: The time it takes a wave to complete one wavelength is referred to as its time period.
Very Long Answers Questions [5 Marks Questions]
Ques. List the effects of radiation on the human body.
Ans. The following are the effects of radiation on the human body
- Hair Loss: When radiation exposure is more than 200 rems, hair loss occurs.
- Effect on Heart and Brain: The heart's ability to pump blood will be impacted by intense radiation exposure between 1000 and 5000 rems. Radiation damages the heart's small blood arteries and nerve cells, which might result in instant death. If the radiation exposure is more than 5000 rems, brain cells are damaged.
- Effect on Thyroid Gland: When exposed to certain radiation sources, certain body parts are harmed. When exposed to radioactive iodine, the thyroid gland may be affected. A significant amount of radioactive iodine exposure can damage the thyroid completely or in part.
- Effect on Blood System: If a person is exposed to 100 rems, their blood will have fewer lymphocytic cells. Multiple immune function issues might result from this. This is termed mild radiation sickness. According to reports from Hiroshima and Nagasaki, symptoms might persist for more than 10 years after the exposure.
- Effect on Reproductive tract: Because reproductive tract cells divide quickly, they are more prone to damage even if the exposure is only 200 rems.
Ques. What are the different types of radiation?
Ans. Based on the energy of the emitted particle, the two basic types of radiation that exist in nature are:
- Ionizing radiation: These radiations have an energy of greater than 10 eV. This energy is sufficient for breaking chemical bonds by ionizing atoms and molecules. Microwave radiation, radio waves, and infrared radiation are all associated with it.
- Non-ionizing radiation: These radiations contain alpha, beta, and gamma particles.
Other types of radiation are
- Thermal Radiation: A body emits thermal radiation as a result of its temperature. The surface of an object is important in determining how much radiant energy it will release or absorb.
- Nuclear Radiation: It is the energy produced by nuclear decay through elementary particles of the atomic nucleus. Alpha radiation, Beta radiation, Gamma radiation, and X-ray are the types of Nuclear radiation.
- Gravitational Radiation: This radiation behaves similarly to gravitational waves or ripples in space-time curvature.
- Black body Radiation: A black body is a body that completely absorbs heat radiation of any wavelength. When such a body is heated, it releases radiations of all wavelengths.
Ques. What are the applications of radiation?
Ans. The following are the applications of radiation
- Radiation is commonly used in a variety of sectors, including medicine, communication, and science.
- It also has several scientific applications, like as the use of radioactive atoms to identify the age of objects that formerly belonged to a live organism.
- In today's communications technologies, electromagnetic radiation is utilized. The variations in the strength of the given sounds, images, or other information show the changes.
- Radioactive substances are employed in medicine for diagnosis, treatment, and research.
- X-rays may penetrate muscles and other soft tissues. As a result, X-rays enable doctors to identify fractured bones as well as any tumor in the body.
- It is used in cancer therapy by doctors.
- It removes or modifies genes to prevent cell growth. Its other forms, such as radio waves, microwaves, and light waves, are non-ionizing.
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