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Ans. (a) violet and red
Explanation:
The extreme colors in a pure spectrum of light (as seen in a rainbow or produced by the dispersion of white light through a prism) are:
So, the extreme colors in a pure spectrum of light are red and violet
Ans. (b) One plane, One convex
Explanation:
If earth doesn’t have an atmosphere, there will be scattering of light, which will make the sky appear to black. If there were no atmosphere on Earth, there would be no scattering of sunlight in the atmosphere. As a result, the sky would appear black during the day, much like how space looks to astronauts on the Moon or when they are in orbit outside of Earth's atmosphere. The Sun would appear as a bright point of light against the black background, and stars would be visible even during the day.
Explanation:
The blue color of the sky is primarily due to the Rayleigh scattering of sunlight by the molecules and tiny particles in the Earth's atmosphere. Rayleigh scattering is a characteristic property of light that describes how the scattering of light is inversely proportional to the fourth power of its wavelength.
Because blue light has a shorter wavelength compared to other colors in the visible spectrum, it is scattered more by the molecules in the atmosphere. This means blue light is scattered in all directions by the gases and particles in the sky, making the sky predominantly blue during a clear day.
Explanation:
In a prism, the refraction of light takes place at the two slant surfaces. The dispersion of white light occurs at the first surface of prism where its constituent colours are deviated through different angles. At the second surface, these splitted colours suffer only refraction and they get further separated. But in a rectangular glass block, the refraction of light takes place at the two parallel surfaces. At the first surface, although the white light splits into its constituent colours on refraction, but these splitted colours on suffering from refraction at the second surface emerge out in the form of a parallel beam, which give an impression of white light.
Explanation:
Sun, and Artificial lamps and bulbs are two sources of ultraviolet radiations.
The Sun: The Sun is the primary natural source of UV radiation. Solar radiation includes UV-A, UV-B, and UV-C rays. However, most of the UV-C rays and a portion of UV-B rays are absorbed by the Earth's atmosphere, primarily by the ozone layer.
Artificial Lamps and Bulbs: There are several artificial sources of UV radiation, including black lights, mercury-vapor lamps, tanning lamps, and UV sterilization lamps (used to disinfect air, water, and surfaces). Some types of lasers can also produce UV radiation.
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Download NowChapter No. | Chapter Name |
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Chapter 1 | Force Work Power and Energy |
Chapter 2 | Simple Machines |
Chapter 3 | Refraction of Light |
Chapter 4 | Refraction Through Lenses |
Chapter 5 | Spectrum |
Chapter 6 | Sound |
Chapter 7 | Electricity |
Chapter 8 | Electrical Power and Household Circuits |
Chapter 11 | Magnetic Effect of Current |
Chapter 12 | Specific Heat Capacity and Latent Heat |
Chapter 13 | Radioactivity and Nuclear Energy |
Chapter Wise Important Questions for ICSE Board Class 10 Physics |
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Force Work Power and Energy |
Simple Machines |
Refraction of Light |
Refraction Through Lenses |
Spectrum |
Sound |
Electricity |
Electrical Power and Household Circuits |
Magnetic Effect of Current |
Specific Heat Capacity and Latent Heat |
Radioactivity and Nuclear Energy |
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