State the factor, which controls :
(i) wavelength of light, and
(ii) intensity of light emitted by an LED.
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Which cell organelle controls most of the activities of the cell?
Hint— Nucleus
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Light enters from air into glass having refractive index 1.50. What is the speed of light in glass? The speed of light in vacuum is 3 x 108 ms-1.
Given,n=1.5 and the speed of light in vacuum, c = 3x 108 ms-1. We know that the refractive index is given by the expression n =c/v where c is the...
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Mention the part of the brain which controls the involuntary actions
Medulla in the hind brain.
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A mixture of light, consisting of wavelength 590nm and an unknown wavelength,
(c) : For interference, by Young’s double slits, the path difference xd/D= nλ for bright fringes and xd/D = (2n +1)λ/2 for getting dark fringes. The central fringes when x =...
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A light source emits monochromatic light of wavelength 555 nm. The source consumes 100 W of electric power
Overall luminous efficiency =Total luminous flux / Power input =35x685/100 = 239.75 lumen/W
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Which of the following forest plants controls the light conditions at the ground?
c. The following forest plants controls the light conditions at the ground Tall trees.
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Arrange the following in descending order of wavelength: X-rays, Radio waves, Blue light, Infrared light
Radiowaves, Infrared light, Blue light, X-rays.
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Consider the following statements: 1. Light of longer wavelength are scattered much more than the light of shorter wavelength.
(d) Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency...
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A gas of hydrogen-like ions is prepared in a particular excited state A. It emits photons having wavelength equal to the wavelength
a) The gas emits 6 wavelengths, let it be in nth excited state. => n(n-1)/2=6=>n=4 So, The gas is in 4th excited state. b) Total no.of wavelengths in the transition is 6. We have ...
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Using factor theorem, show that a - b is the factor of a(b^2 - c^2) + b(c^2 - a^2) + c(a^2 - b^2)
By factor theorem, (a - b) will be the factor of the given expression if it vanishes by substituting a = b is it Substituting a = b in the...
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