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Which is not true with respect to the ca...

Which is not true with respect to the cathode rays ?

A

A stream of electrons

B

Charged particles

C

Move with speed same as that of light

D

Can be deflected by magnetic fields

Text Solution

Verified by Experts

The correct Answer is:
C
Speed of the cathode rays is `10^(7)m//sec - 3 xx 10^(7) m//s`
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Which is not true with respect to cathode rays :

The existence of negatively charged particle in an atom was shown by J.J. Thomson as a result of the studies of the passage of electricity through gases at extremely low pressure known as discharge tube experiments. When a high voltage of the order of 10,000 volts or more was impressed across the electrodes, some sort of invisible rays moved from the negative electrode to the positive electrode these rays are called as cathode rays. Cathode rays travel in straight path in absence of electrical and magnetic field . Cathode rays consist of material part and charged particles? Cathode rays produce X-rays and light is emitted when they strike on ZnS screen. Cathode rays penetrate through thin sheets of aluminium and other metals . They affect the photogenic plate and passes heating effect when they strike on metal foil. The raito of charge to mass i.e charge/mass is same for all the cathode rays irrespective of the gas used in the tube. The existence of positively charged particle in an atom was shown be E. Goldstein. He repeated the same discharge tube experiments by using a perforated cathode. It was observed that when a high potential difference was applied between the electrodes, not only cathode rays were produced but also a new type of rays were produced simultaneoulsy from anode moving towards cathode and passes through the holes or canal of the cathode. These termed as canal rays or anode rays. These rays travel in straight lines and consists of positively charged particles. These rays have kinetic energy and produces heating effect also. The e/m ratio of these rays is smaller than that of electrons. Unlike cathode rays, their e/m value is dependent upon the nature of the gas taken in the tube. These rays produced flashes of light on ZnS screen and can pass throughs thin metal foils. They can produce physical and chemical changes and are capable to produce ionisation in gases. Which is not true with respect to cathode rays?

Cathode rays are

Cathode rays are

What are cathode rays ?

Cathode rays have

Cathode rays have:

A2Z-ATOMIC PHYSICS-Section D - Chapter End Test
  1. Which is not true with respect to the cathode rays ?

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  3. The diagram shown the energy levels for an electron in a certain atom....

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  4. An energy of 24.6 eV is required to remove one of that electrons from ...

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  5. The transition from the state n = 4 to n = 3 in a hydrogen-like atom r...

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  6. A hydrogen atom and a Li^(2+) ion are both in the second excited stat...

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  7. The electric potential between a proton and as electron is given by V=...

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  8. A hydrogen like atom with atomic number Z is in an excited state of q...

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  9. The transition from the state n = 4 to n = 3 in a hydrogen-like atom r...

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  10. In a hypotherical Bohr hydrogen, the mass of the electron is doubled. ...

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  11. What is the radius of iodine atom (at no. 53, mass number 126)?

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  12. An electron passing through a potential difference of 4.9 V collides w...

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  13. Which of the following atoms has the lowest ionization potential ?

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  14. The seond line of Balmer series has wavelength 4861 Å The wavelength o...

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  15. If the wavelength of photon emitted due to transition of electron from...

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  16. If the series limit wavelength of the Lyman series for hydrogen atom i...

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  17. The first line of Balmer series has wavelength 6563 Å. What will be th...

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  18. An atom makes a transition from a state of energy E to one of lower en...

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  19. The ratio of the speed of the electron in the first Bohr orbit of hyd...

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  20. An electron in H atom makes a transition from n = 3 to n = 1. The reco...

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  21. If the atom(100)Fm^(257) follows the Bohr model the radius of (100)Fm^...

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