The spectral line in the spectrum of light from a star is found to be shifted by 0.032% from its normal position towards the red end of the spectrum . Compute the velocity of the star.
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A particle is moing with a velocity of `10m//s` towards east. After 10s its velocity changes to `10m//s` towards north. Its average acceleration is:-
Correct Answer - B Acceleration `veca=(Deltavecv)/(Deltat)=(10hatj-10hati)/(10)` `=-hati+hatj` (west north) `|veca|=sqrt(1+1)=sqrt(2)` (north-west)
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In what region of the electromagnetic spectrum would you look the spectral line resulting from the electronic transition from the tenth to the fifth e
Correct Answer - 2 Wave nimbers are the reciprocals of wavelengths and are given by the expression `bar(v)=1/lambda` `1/bar(v)=1.1xx10^(5)[1/n_(1)-1/n_(2)]`
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A normal human eye can detect yellow light if more than 10 photons enter into it per second. A star is generating as much power as the Sun and is emit
Correct Answer - `1.64 xx 10^(19) m`
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A star is at a distance of `50xx10^(12)` km from earth. If the star disappears due to collision with some other star so that its light is extinguished
Correct Answer - `5.3`years
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An iron ring of mean circumferential length 30 cm and cross-section 1 `cm^(2)` is wound uniformly with 300 turns of wire . When a current of `0.032` A
Correct Answer - `2xx10^(-3)WB m^(-2), 30 A "turns" m^(-1), 500`
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A star is moving away from an observer with a speed of `500 kms^(-1)` .Calculate the Doppler shift if the wavelength of light emitted by the star is 6
Correct Answer - Increase of `10Å`
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A star is moving towards the earth with a speed of `9.0 xx10^(6) ms^(-1)` . If the wavelength of a particular spectral line emitted by it si 6000 `Å`
Correct Answer - `5820Å`
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An urn contains 9 red, 7 white and 4 black balls. A ball is drawn at random. Find the probability that the ball drawn is (i) red (ii) white (iii) red
Correct Answer - `(i) 9/20 (ii) 7/20 (iii) 4/5 (iv) 11/20 (v) 13/20`
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निम्नलिखित में सार्थक अंकों की संख्या लिखिए : (a) `0.007 m^(2)` (b) `2.64 xx 10^(24) kg` (c) `0.2370 g cm^(3)` (d) `6.320 J` (e) `6.032 N m^(-2)` (f)
Correct Answer - (a) 1; (b) 3; (c) 4; (d) 4, (e) 4; (f) 4
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An emission spectrum consists of , bright spectral lines on a dark back ground.
D) Velocity of light
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