Suppose the eyes of an alien being are sensitive to microwaves. Do you except the alien being to have larger or smaller eyes than ours?
Suppose the eyes of an alien being are sensitive to microwaves. Do you except the alien being to have larger or smaller eyes than ours?
Text Solution
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The wavelength of microwave is much larger that of visible light. The microwaves can enter
the eyes and produce the sensation of sight if the size of the eyes and the ratina are comprable to the wavelength of microwaves. Therefore, the alien being sould have much larger eyes than ours.
the eyes and produce the sensation of sight if the size of the eyes and the ratina are comprable to the wavelength of microwaves. Therefore, the alien being sould have much larger eyes than ours.
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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 is shared by the entire food. The frequency of rotation of water molecules is about:
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 is shared by the entire food. The frequency of rotation of water molecules is about:
A
2.45 MHz
B
2.45 kHz
C
2.45 GHz
D
2.45 THz
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In case of a compound microscope which of the following Statements is/are correct ? 1. The focal length of the eye piece is larger than the focal length of the objective 2. The focal length of the eye piece is smaller than the focal length of the objective 3. The image produced in a normal optical microscope is real 4. The image produced in a normal optical microscope is virtual Select the correct answer using the code given below:
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a 1 only
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b 1and 4
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Life priorities and (1301) are never going to reduce. But among all of them, make some time for (1302) the well being of the environment you live in. To save our environment, (1303) life changing movement, is required. If anything is required, that is will power, honest (1304) and some small initiatives. Save our environment by being a responsible citizen. Teach your child and others to save water. Do not waste water. It's a very (1305) element of our environment.
A
dreams
B
ambitions
C
passions
D
necessities
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