It is belived that the Universe is expan...

It is belived that the Universe is expanding and hence the distant stars receding from us. Light form such a star will show

shift in frequency towards longer wavelength

shift in frequency towards shorter wavelength

No shift in frequency but a decrease in intensity

A shift in frequency sometimes towards longer and sometimes towards shorter wavelength

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It is believed that the universe is expanding and hence the distant stars are receding from us. Light from such a star will show

Light energy emitted by star is due to

Detection of Hydrogen Hydrogen is prevalent in the universe. Life in the universe is ultimately based on hydrogen. The are about 1xx 10^(23) atars in the universe. Assume that they are like our sun (radius 700.000 km , density, 1.4 g//cm^(-3) 3//4 hydrogen and 1//4 helium by mass). Estimate the number of stellar protons in the universe to one significant figure. In the 1920s , Cecilia Payne discovered, by spectral analysis of starlight , that hydrogen is the most abundant element in most stars.

Faint band of stars observed in the night sky from north to south direction is

Let a star be much brighter than our sun but its mass is same as that of sun If our earth has average lift span of man as 70 years In the earth like planet of this star system having double the distance from our star find the average lift span of a man on this planet in terms of our year .

Light emitted from a distant star is observed at frequency 5000 MHz for the star stationary with respect to us. If the star starts approaching us with speed 6xx10^(5)m//s . Then the observed frequency will be

Total number of stars present in universe is

A 6000 Å H_(beta) line emitted by hydrogen in a star is observed to be red shifted by 10 Å. Find the speed with which star is receding away from the earth.

Although a photon has no rest mass, but it possesses the inertial mass m="hf"/c^2 where h is Planck's constant , f is frequency of light and c is speed of light . Since light is deflected by a gravitational field , so it is naturally assured that photons have same gravitational behaviour as other particles. When photon is emitted from source of star of mass M and radius R, total energy of photon will be sum of hf and gravitational potential energy. At a large distance from star, the photon is beyond the star's gravitational field , so its gravitational potential energy becomes zero but its total energy remains constant. So frequency of a photon emitted from surface of a star decreases as it moves away from star. A photon in visible region of spectrum is thus shifted towards red end, and this phenomena is known as gravitational red shift. The potential energy of photon which is at surface of star is (where , M=Mass of the star , R=Radius of the star, G=Universal gravitational constant )

AAKASH SERIES-WAVE OPTICS-Additional Practice Exercise (Level - I) (Main) Straight objective type questions

The phase difference between two waves reaching a point is (pi)/(2). W...
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Three coherent waves having amplitudes 12mm, 6mm and 4mm arrive at a g...
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For constructive interference to take place between two monochromatic ...
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If the amplitude ratio of two sources producing interference is 3:5 th...
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Young's double slit experiment is made in a liquid. The tenth bright f...
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In Young's double slit experiment, the intensity of light at a point o...
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In Young's double slit experiment the distance between slits is 2 xx 1...
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In Young's double slit experiment, when light of wavelength 4000 A^(@)...
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In Youngs double slit experiment, the phase different between two cohe...
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In the ideal double-slit experiment, when a glass-plate (refractive in...
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In Young's double slit experiment, 12 fringes are observed to be forme...
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Young's double-slit experiment is carried ot by using green, redj and ...
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It is belived that the Universe is expanding and hence the distant sta...
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The 6563 overset(o)(A) line emitted by hydrogen atom in a star is foun...
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In context of Doppler's effect in light, the term 'red shift' sighifie...
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Light enters in a glass slab of refractive index 3/2 and covers a dist...
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