Science
Choose the correct option from the below which explains the reason for us to perceive the day sky as blue.
options
- As sunlight passes through the atmosphere, shorter wavelengths, such as blue are scattered more than other colors.
- The sky appears blue because all colors are scattered equally, but blue light is stronger and more visible to the human eye.
- The blue color of the sky is due to longer wavelengths like red and orange scattering more than shorter wavelengths, making blue stand out more.
- The atmosphere contains blue-colored particles that give the sky its blue appearance.
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Answer
As sunlight passes through the atmosphere, shorter wavelengths, such as blue are scattered more than other colors.
Reason — When sunlight enters the Earth’s atmosphere, it interacts with tiny air molecules and dust particles which is known as Rayleigh scattering.
The amount of scattering is inversely proportional to the fourth power of the wavelength, meaning shorter wavelengths (like blue and violet) are scattered much more than longer wavelengths (like red and yellow).
Although violet light is scattered even more than blue, our eyes are more sensitive to blue light.
Therefore, the sky appears blue to us during the day due to difference in scattering amount for different colours (wavelengths).
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(a) What type of bond is formed between carbon and oxygen?
(b) Identify the type of bond formed between Calcium and oxygen.
(c) Which of the above compounds will be a good conductor of electricity in molten state and why?
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Arnav was making notes and he wrote down the following statements from his understanding of reflection from curved surfaces.
I. Concave mirrors can produce both real and virtual images depending on the position of the object.
II. Convex mirrors always produce real, inverted images regardless of the object’s position.
III. In both concave and convex mirrors, the image location can be determined using the mirror formula where is the focal length, is the image distance, and is the object distance.
Choose from the following the correct option that lists the correct statements about reflection from curved surfaces.
options
- I and II
- I, II and III
- II and III
- I and III
Assertion (A): A point object is placed at a distance of 26 cm from a convex mirror of focal length 26 cm. The image will not form at infinity.
Reason (R): For above given system the equation gives v = ∞.
options
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
The below image shows the formation of an image with an optical instrument.
(a) Identify the optical instrument (shown schematically as a rectangle) in the image.
(b) What type of image is formed in this case?
(c) Based on the measurements given in the image, calculate the focal length of the instrument.