A 25 watt bulb emits monochromatic light of wave length 0.75 x10-6 meter . calculate rate of emission of quanta per sec
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Which one has more resistance 100 watt bulb or 60 watt bulb both operating at 220V?
The resistance of 60watt bulb is greater than the resistance of 100watt bulb.
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In an electric bulb, light is produced due to the glowing of (a) the glass case of the bulb.
(b) the thin filament.
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A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited
Time taken by the laser beam to return to Earth after reflection from the Moon = 2.56 s Speed of light = 3 × 108 m/s Time taken by the laser beam to...
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When a (60W, 220V) bulb and a (100 W, 220 V) bulb are connected in series, then which bulb will glow brighter?
The resistance of the bulb is given by R =v2/ P. So, the resistance of 60 W bulb is more than the resistance of 100 W bulb. When they are connected...
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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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A source emits 31.4 W of radiant flux distributed uniformly in all directions. The luminous efficiency is 60 lumen/watt.
Radiant flux = 31.4W, Solid angle = 4π Luminous efficiency = 60 lumen/W So, Luminous flux = 60 × 31.4 lumen And luminous intensity =Lumin ous Flux/4π =60x31.4/4π = 150 candela
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The elastic limit of steel is 8 x10^8 N/m^2 and its Young's modulus 2 x10^11 N/m^2.
It means the maximum stress in the wire σ= 8 x10⁸ N/m² Y =2.0 x10¹¹ N/m² Length of the wire L =0.50 m Let corresponding maximum elongation = l m Strain ε= l/L =l/0.50...
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The oscillating magnetic field in a plane electromagnetic wave is given by By = (8 x10^-6)sin[2 x10^11t + 300πx]T
(i) Standard equation of magnetic field is By = B0sin(ωt + kx)T Comparing this equation with the given equation, we get B0 = 8 x 10-6T, ω = 2 x 1011 rad s-1, k...
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Find the wave length of Yellow emission of sodium whose frequency 5.09 x 10^14 per sec.
wave length = C/V0 = 3x 108 /5.09x1014 = 5.89 x10-7 meter
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A 220V, 100W Bulb is connected to a 110V source. Calculate the power consumed by the bulb?
correct answer is (b) 15W.
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