Why do two flashlights have different brightness?

Why do two flashlights have different brightness?
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Last Answer : (c) to lay more stress on the brightness of the eyes and the stars.

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Description : A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its ... d) What is seen on the screen when the flame is very close (at about 5 cm) to the lens?

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Last Answer : Luminosity

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Description : In an oscilloscope, ___ adjusts the brightness of the spot by chaning the current on the control grid.

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In regard to shade, chroma is: A. Brightness B. Saturation of hue C. Value

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Newton’s rings experiment is performed and radius (or diameter) is calculated. Now Plano-convex lens is replaced with another Plano-convex lens of greater Radius of curvature. What will be effect on radius (or diameter)? (a) Radius (or diameter) will remain constant but there will be more brightness (b) Radius (or diameter) will increase (c) Radius (or diameter) will decrease (d) There will be no effect

Description : Newton's rings experiment is performed and radius (or diameter) is calculated. Now Plano-convex lens is replaced with another Plano-convex lens of greater Radius of curvature. What will be effect on radius ( ... ) will increase (c) Radius (or diameter) will decrease (d) There will be no effect

Last Answer : (b) Radius (or diameter) will increase

Newton’s rings experiment is performed with air gap between lens and plate. Now that gap is filled with water. What will be effect on radius (or diameter)? (a) Radius (or diameter) will remain constant but there will be more brightness (b) Radius (or diameter) will increase (c) Radius (or diameter) will decrease (d) There will be no effect

Description : Newton's rings experiment is performed with air gap between lens and plate. Now that gap is filled with water. What will be effect on radius (or diameter)? (a) Radius (or diameter) will remain ... or diameter) will increase (c) Radius (or diameter) will decrease (d) There will be no effect

Last Answer : (c) Radius (or diameter) will decrease

In Newton’s rings experiment, if monochromatic source of light is replaced by another monochromatic source of higher wavelength. What will be the effect on radius (or diameter)? (a) Radius (or diameter) will decrease (b) Radius (or diameter) will increase (c) There will be no effect (d) Radius (or diameter) will remain constant but there will be more brightness

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Last Answer : (b) Radius (or diameter) will increase

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Last Answer : (a)Location of observer

The blaze lit up the escaped diners with a light greater than any other that could be produced in the night' can be paraphrased as (1) ‘The fire set all the escaped diners ablaze.' (2) ‘The light that set the escaped diners on fire was from a divine night fixe.' (3) ‘The night sky was lit by such brightness that one could, see the blaze clearly.' (4) ‘The fire burned in such a way that the writer could see the escaped diners clearly.'

Description : The blaze lit up the escaped diners with a light greater than any other that could be produced in the night' can be paraphrased as (1) The fire set all the escaped diners ablaze.' (2) The light ... clearly.' (4) The fire burned in such a way that the writer could see the escaped diners clearly.'

Last Answer : (4) ‘The fire burned in such a way that the writer could see the escaped diners clearly.'

The ENERGY associated with a photon depends upon the photon's: w) velocity x) frequency y) amplitude z) the brightness of the source from which it comes

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‘Parsec’ is the unit measurement of (1) Density of stars (2) Astronomical distance (3) Brightness of heavenly bodies (4) Orbital velocity of giant stars

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Last Answer : Astronomical distance

Time of exposure required for taking photograph of an object depends upon the (1) brightness of the object (2) skill of photographer (3) proximity of object (4) size of the object

Description : Time of exposure required for taking photograph of an object depends upon the (1) brightness of the object (2) skill of photographer (3) proximity of object (4) size of the object

Last Answer : brightness of the object

Stars in the sky appear to twinkle due to (1) a series of refractions (2) a series of reflections (3) a surface tension phenomenon (4) multiple diminishing brightness

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Last Answer : a series of refractions