Positive Rays and Neutrons
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Explain the characteristics of cathode rays.
Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of 6C12
- Will remain approximately the same
- Will become approximately two times
- Will remain approximately half
- Will be reduced by 25%
The charge on the electron was determined by
Cathode rays are made up of________________ charged particle.
- 1.6022
- -1.6022
- -9.1094
- The mass of the positive rays depends on the atomic weights or molecular weights of the gases in the discharge tube.
- The deflection of positive rays under the influence of an electric and magnetic fields is smaller than that of the cathode rays
- Canal rays travel from the positive electrode to the negative electrode
- All of the above
- Anode rays travel in a straight line in the absence of electric and magnetic field
- The impact of electric and magnetic fields is opposite to the impact on cathode ray
- The properties of anode rays does not depend on the nature of the gas taken in the discharge tube
- Anode rays possess a positive charge
Give the important difference between:
Canal rays and Cathode rays.
- alpha particle were bombarded on beryllium foil to emit neutron and form carbon
- The particles produced show deflection in presence of magnetic field.
- Paraffin wax wall is used to absorb neutrons
- alpha particle were bombarded on beryllium foil to emit neutron and form oxygen
Identify the correct statement for the following system.
- Upper terminal is positive terminal
- Lower terminal is positive terminal
- Lower terminal is negative terminal
- Can not be predicted
- Anode rays travel in a straight line in the absence of electric and magnetic fields
- They travel from anode to cathode
- The e/m ratio of anode rays is constant
- They are produced by the ionization of the gas in the discharge tube
Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of 6C12
- Will remain approximately the same
- Will become approximately two times
- Will remain approximately half
- Will be reduced by 25%
Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two times respectively to their actual masses, then the atomic mass of 6C12
- Will remain approximately the same
- Will become approximately two times
- Will remain approximately half
- Will be reduced by 25%
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isotopes: Atoms having same number of proton
Isobar: Elements having same mass number
Isotones: Elements having same number of neutron (A-Z)
Which of the following is a pair of isobar?
- 7N15, 8O16
- 6C13, 7N13
- 6C13, 7N14
- 7N13, 8O15
- 260.3g
- None of the above
- 26.03×101g
- 2.6×102g
Proton has the charge of +1.6022 × 10−19C.
True
False
- 1
- 2
- 3
- 4
Who discovered Neutrons? How was the discovery made?
- Same for all gases
- Different for different gases
- Has a value of 1
- Has a value of 1.6×10−19
Why did the discovery of neutrons came very late?
Neutrons are present in nucleus
Neutrons are highly unstable particles
Neutrons do not carry a charge
Neutrons do not have mass
The charge of electron is_________________C.
- 1.6022
- -1.6022
- -9.1094
- e < p < n < α
- n < p < e < α
- n < α < p < e
- n < p < α < e
- 25 % more
- 75 % less
- 25 % less
- 50 % more