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The velocity of the electron in the firs...

The velocity of the electron in the first Bohr orbit as compared to that of light is about

A

1/300

B

1/500

C

1/137

D

1/187

Text Solution

Verified by Experts

The correct Answer is:
C
`v_1^H = 2.19 xx10^6 m//s ~~ (c ) /(137).`
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DC PANDEY-MODERN PHYSICS - 1-Level 1 Objective
  1. According to Einstein's photoelectric equation, the plot of the maximu...

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  2. The velocity of the electron in the first Bohr orbit as compared to th...

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  3. 86A^222rarr84B^210. In this reaction, how many alpha and beta particl...

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  4. An X-ray tube is operated at 20 kV. The cut off wavelength is

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  5. An X-ray tube is opearted at 18 kV. The maximum velocity of electron s...

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  6. what is the ratio of de-Broglie wavelength of electron in the second a...

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  7. The energy of a hydrogen like atom (or ion) in its ground state is -12...

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  8. The operating potential in an x-ray tube is increased by 2%. The perce...

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  9. The energy of an atom or ion in the first excited state is -13.6 eV. I...

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  10. in order that the short wavelength limit of the continuous X-ray spec...

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  11. The momentum of an x-ray photon with lambda = 0.5 Å is

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  12. The work function of a substance is 1.6 ev. The longest wavelength of ...

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  13. Find the binding anergy of an electron in the ground state of a hydrog...

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  14. What is the energy of a hydrogen atom in the first excited state if th...

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  15. Light of wavelength 330nm falling on a piece of metal ejects electrons...

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  16. Maximum kinetic energy of a photoelectron is E when the wavelength of ...

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  17. if the frequency fo Ka X-ray emitted from the element with atomic numb...

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  18. According to Mseley's law, the ratio of the slope of graph between sqr...

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  19. if the electron in hydrogen orbit jumps form third orbit to second or...

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  20. A potential of 10000 V is applied across an x-ray tube. Find the ratio...

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