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Class 12 Exam  >  Class 12 Questions  >  Oscillating circuits producea)Radio frequenci... Start Learning for Free
Oscillating circuits produce
  • a)
    Radio frequencies
  • b)
    Power frequencies
  • c)
    Microwaves
  • d)
    Ultra violet Rays
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Oscillating circuits producea)Radio frequenciesb)Power frequenciesc)Mi...
The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in an electric power grid transmitted from a power station to the end-user.An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave. An RF oscillator produces signals in the radio frequency (RF) range of about 100 kHz to 100 GHz.
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Oscillating circuits producea)Radio frequenciesb)Power frequenciesc)Mi...
Hey mate....What is an Oscillator?

An oscillator is a circuit which produces a continuous, repeated, alternating waveform without any input. Oscillators basically convert unidirectional current flow from a DC source into an alternating waveform which is of the desired frequency, as decided by its circuit components.
The basic principle behind the working of oscillators can be understood by analyzing the behavior of an LC tank circuit shown in Figure 1 below, which employs an inductor L and a completely pre-charged capacitor C as its components. Here, at first, the capacitor starts to discharge via the inductor, which results in the conversion of its electrical energy into the electromagnetic field, which can be stored in the inductor. Once the capacitor discharges completely, there will be no current flow in the circuit.
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Oscillating circuits producea)Radio frequenciesb)Power frequenciesc)Mi...
Oscillating circuits, also known as LC circuits or tank circuits, are electrical circuits that produce oscillations or alternating current. These circuits consist of inductors (L) and capacitors (C) connected in a closed loop. When the circuit is energized, energy is stored in the magnetic field of the inductor and the electric field of the capacitor, and it oscillates back and forth between the two.

Radio Frequencies:

One of the main applications of oscillating circuits is in the production of radio frequencies. Radio waves are a type of electromagnetic radiation that is used for wireless communication, broadcasting, and various other applications. The frequency range of radio waves typically falls within the range of 3 kHz to 300 GHz. Oscillating circuits can be tuned to generate specific radio frequencies by adjusting the values of the inductance and capacitance in the circuit. This allows for the transmission and reception of radio signals.

Power Frequencies:

Oscillating circuits can also produce power frequencies, which are the frequencies used for the transmission and distribution of electrical power. Power frequencies are typically in the range of 50 Hz to 60 Hz, depending on the country. Oscillating circuits can be used in power generation and distribution systems to convert electrical energy from one form to another, such as from AC (alternating current) to DC (direct current) or vice versa.

Microwaves and Ultra Violet Rays:

While oscillating circuits can produce electromagnetic radiation across a wide range of frequencies, they are not typically used to generate microwaves or ultraviolet rays. Microwaves have much higher frequencies than radio waves, typically in the range of 300 MHz to 300 GHz. They are commonly used in microwave ovens, telecommunications, and radar systems. Ultraviolet rays have even higher frequencies, ranging from 10^15 Hz to 10^17 Hz. They are part of the electromagnetic spectrum and have various applications in medicine, sterilization, and astronomy.

In conclusion, oscillating circuits primarily produce radio frequencies and power frequencies. They are widely used in radio communication systems and power generation and distribution systems. While they can generate electromagnetic radiation across a wide range of frequencies, they are not typically used to produce microwaves or ultraviolet rays.
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Read the following text and answer the following questions on the basis of the same:Microwave oven:The spectrum of electromagnetic radiation contains a part known as microwaves. These waves have frequency and energy smaller than visible light and wavelength larger than it. What is the principle of a microwave oven and how does it work ? Our objective is to cook food or warm it up. All food items such as fruit, vegetables, meat, cereals, etc., contain water as a constituent. Now, what does it mean when we say that a certain object has become warmer? When the temperature of a body rises, the energy of the random motion of atoms and molecules increases and the molecules travel or vibrate or rotate with higher energies. The frequency of rotation of water molecules is about 2.45 gigahertz (GHz). If water receives microwaves of this frequency, its molecules absorb this radiation, which is equivalent to heating up water. These molecules share this energy with neighbouring food molecules, heating up the food. One should use porcelain vessels and non metal containers in a microwave oven because of the danger of getting a shock from accumulated electric charges. Metals may also melt from heating. The porcelain container remains unaffected and cool, because its large molecules vibrate and rotate with much smaller frequencies, and thus cannot absorb microwaves. Hence, they do not get eaten up. Thus, the basic principle of a microwave oven is to generate microwave radiation of appropriate frequency in the working space of the oven where we keep food. This way energy is not wasted in heating up the vessel. In the conventional heating method, the vessel on the burner gets heated first and then the food inside gets heated because of transfer of energy from the vessel. In the microwave oven, on the other hand, energy is directly delivered to water molecules which are shared by the entire food.Q. In the microwave oven,

Read the following text and answer the following questions on the basis of the same:Microwave oven:The spectrum of electromagnetic radiation contains a part known as microwaves. These waves have frequency and energy smaller than visible light and wavelength larger than it. What is the principle of a microwave oven and how does it work ? Our objective is to cook food or warm it up. All food items such as fruit, vegetables, meat, cereals, etc., contain water as a constituent. Now, what does it mean when we say that a certain object has become warmer? When the temperature of a body rises, the energy of the random motion of atoms and molecules increases and the molecules travel or vibrate or rotate with higher energies. The frequency of rotation of water molecules is about 2.45 gigahertz (GHz). If water receives microwaves of this frequency, its molecules absorb this radiation, which is equivalent to heating up water. These molecules share this energy with neighbouring food molecules, heating up the food. One should use porcelain vessels and non metal containers in a microwave oven because of the danger of getting a shock from accumulated electric charges. Metals may also melt from heating. The porcelain container remains unaffected and cool, because its large molecules vibrate and rotate with much smaller frequencies, and thus cannot absorb microwaves. Hence, they do not get eaten up. Thus, the basic principle of a microwave oven is to generate microwave radiation of appropriate frequency in the working space of the oven where we keep food. This way energy is not wasted in heating up the vessel. In the conventional heating method, the vessel on the burner gets heated first and then the food inside gets heated because of transfer of energy from the vessel. In the microwave oven, on the other hand, energy is directly delivered to water molecules which are shared by the entire food.Q. As compared to visible light microwave has frequency and energy

Oscillating circuits producea)Radio frequenciesb)Power frequenciesc)Microwavesd)Ultra violet RaysCorrect answer is option 'B'. Can you explain this answer?
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