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The ratio e//m i.e. specific , for a cat...

The ratio `e//m` i.e. specific , for a cathode ray

A

has the smallest value when the discharge tube is filled with `H_(2)`

B

is constant

C

varies with the atomic number of gas in the discharge tube

D

varies with the atomic number of an element forming the cathode

Text Solution

Verified by Experts

The correct Answer is:
B
Cathode Rays - consists of`e^(-)s` and `e^(-)s` have a fixed e/m ratio.
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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. For cathode rays the value of e/m:

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?

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. Select the incorrect statement.

Which is not true with respect to the cathode rays ?

The difference between the two specific heat capacities (at constant pressure and volume) of a gas is 5000 J kg^(-1) K^(-1) and the ratio of these specific heat capacities, i.e., C_(V) and C_(P) is 1.6. Then C_(V) and C_(P)

VMC MODULES ENGLISH-ATOMIC STRUCTURE-LEVEL - 1
  1. Which of the following is isoelectronic with carbon?

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  2. Which of the following pair is isodiaphers?

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  3. The ratio e//m i.e. specific , for a cathode ray

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  4. In photoelectric effect, the number of photoelectrons emitted is propo...

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  5. Einstein's photoelectric equation states that E(k) = h v - W . In this...

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  6. The maximum kinetic energy of the photoelectrons is found to be 6.63xx...

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  7. Bohr’s theory is applicable to:

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  8. If r is the radius of first orbit, the radius of nth orbit of the H at...

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  9. The principal quantum number of H-atom orbital, if the energy of e^(-)...

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  10. Which of the following electronic transition in hydrogen atom will emi...

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  11. The mass of an electron is m, its charge is e and it is accelerated fr...

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  12. The shortest wavelength of H-atom in Lyman series is x, then longest w...

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  13. According to Boohr's theory the angular momentum of an electron in 5th...

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  14. If the energy difference between the ground state of an atom and in ex...

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  15. Consider the following statements for an electron moving in nth orbit ...

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  16. Which is correct statement about proton?

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  17. When a gold sheet is bombarded by a beam of alpha- particle , only a f...

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  18. The charge to mass ratio of alpha- particles is approximately to the...

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  19. Which of the following atom does not contain the same number of proton...

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  20. The radius of which of the following orbit is same as that of the firs...

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