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Assertion : X-ray astronomy is possible ...

Assertion : X-ray astronomy is possible only from satellites orbiting the carth.
: Eliciency of X-rays tclescope is large as compared to any other telescope. Reason

A

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

B

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

C

'A' is true and 'R' is false

D

'A' is false and 'R' is true

Text Solution

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The correct Answer is:
C
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Assertion: X-ray astronomy is possible only from satellites orbiting the earth. Reasion: Efficiency of X-rays telescope is large as compared to any other telescope.

A : Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. R : Atmosphere absorbs X-rays, while visible and radiowaves can penetrate it.

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Assertion : X - rays can penetrate through the flesh but not through the bones. Reason : The penetrating power of X - rays depends on voltage.

Assertion : X-rays are used to study the interior of objects . Reason : X-rays have very short wavelengths and possess electromagnetic character.

Assertion: X-rays cannot be deflected by electric or magnetic fields . Reason: These are electromagnetic waves.

It is teming to think that all possible transituion are permissible and that an atomic spectrum series from the transition of an electron from any intial orbital to any other .However this is not so because a photon a photon has as intrinsic spin angular momentum of sqrt(2) h// 2pi corresponding to S = 1 although it has no charge and no rest mass On the other hand , an electron has got two typwe of agular momentum orbit angular momentum L = [sqrt(l(l+1))] h//2pi ,and spin angular momentum L_(1) = sqrt(s(s + 1)) h//2pi arising from orbital motion and spin motion of the electronn during any electton transition must compentum for the angular momentum carried away by the photon .To salary this condition the different between the azisition quantum number of teh orbital witjhin which the transition (l = 2) cannot make a transition into as x-orbital (l = 0) because the photon cannot carry away enough angular momentum The maximum orbital angular momentum of an electon with n = 5 is

AAKASH SERIES-ATOMS-EXERCISE -IB
  1. When an electron of the hydrogen atom jumps from a higher to lower en...

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  2. (A) hydrogen atom consists of only one electron but its emission spect...

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  3. (A) for the scattering of alpha- particles at large angles, only the n...

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  4. Statement-1 : Between any two given energy levels, the number of abosr...

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  5. (A) atoms of each element are stable and emit characteristic spectrum....

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  6. (A) most of the mass of the atom is concentrated in its nucleus. (R)...

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  7. (A) bohr's third postulaate states that the stationary orbits are thos...

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  8. (A) the total energy of an electron revolving in any stationary orbit ...

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  9. (A) in the experiment of alpha particle scattering, extremely thin gol...

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  10. (A) in alpha particle scattering number of alpha paritcle undergoing h...

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  11. (A) electrons int the atom are held due to coulomb forces. (R) the a...

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  12. (A) according to classical electromagnetic theory an accelerated parti...

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  13. Assertion : A laser beam of 0.2 watt power can drill holes through a m...

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  14. Assertion (A) : LASER is used to measure distant object as moon. Re...

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  15. Assertion In He-Nelaser, population inversion takes place between ener...

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  16. Assertion : Crystalline solids can cause Xrays to diffract. Reason...

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  17. A: In beta-decay an electron is emitted by the nucleus R: Electrons ...

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  18. Assertion : X-ray astronomy is possible only from satellites orbiting ...

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  19. According to Bohr's atomic model

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  20. Assertion : Total energy of electron in an hydrogen atom is negative. ...

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