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, how long would we continue the star (even after it stops) existing. Velocity of light in vacuum `=3xx10^(8)ms^(-1)`.
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`SO_(2)` gas is slowly passed through an aquesous suspension containing 12g `CaSO_(3)` till the milkiness just disappears, what amount of `SO_(2)` wou
Correct Answer - d,d The reaction involed is `underset("64g")underset("1mol")(underset("120g")underset("1mol")underset("milky")(CaSO_(3))+H_(2)O+SO_(2) to underset("colourless")(Ca(HSO_(3))_(2)))` `12"g "CaSO_(3) "will react with" 6.4g"SO_(2) or 0.1"mol" SO_(2)`
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Find the locus of a point `P` which moves such that its distance from the line `y=sqrt(3)x-7` is the same as its distance from `(2sqrt(3),-1)`
The point `(2sqrt(3),-1) " lies on the line y" = sqrt(3)x-7` Therefore, locus of the point is a straight line perpendicular to the given line passing through the given point,...
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The is a point P on the hyperbola `(x^(2))/(16)-(y^(2))/(6)=1` such that its distance from the right directrix is the average of its distance from the
Correct Answer - A Let `P-=(x,y)` `therefore" "(a)/(e)+x=((ex-a)+(ex+a))/(2)` `therefore" "(a)/(e)+x=ex` `therefore" "(16)/(5)+x=(5)/(4)x` `x=(64)/(5)` But, point P lies on the left branch. Therefore, x-coordinate of P is `(-64)/(5)`.
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A moving H-atom makes a head on perfectly inelastic collision with a stationary `Li^(++)` ion. Just before collision, both `- H` and `Li^(++)` are in
Correct Answer - `7.77 keV`
2 Answers 1 views
Find the potential due to a magnet at a point on its axis at a distance of 0.09 m from its centre in the end-on position. The length of the magnet is
Correct Answer - `2.23 xx 10^(-6) J A^(-1)m^(-1)`
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Light travels a certain distance in water in `3 mu` s . How much time it would take for light for travel the same distance in air ? Refractive index o
Correct Answer - `2.2 mu` s
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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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Acceleration due to gravity above the Earth’s surface at a height equal to the radius of the Earth is ______
Correct option is: (A) 2.5 m/s2
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If R is the radius of the Earth and g is the acceleration due to gravity on the Earth’s surface, the mean density of the Earth is
Correct option is: (D) \(\frac{3g}{4\pi RG}\)
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If gravitational force of Earth disappears, what will happen to the satellite revolving round the Earth?
(C) Satellite will escape in tangential path.
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