MEDIUM
Earn 100

Find the total negative or positive charge on a 2 g silver coin. The atomic number and atomic mass of silver is 47 and 107.9 u respectively. Given Avogadro's number is 6.023×1023 g-1 mol-1.

Important Questions on Structure of Atom

EASY
Arrange the following particles in an increasing order of values of e/m ratio: electron e, proton p, neutron n and α -particle α-
EASY
In the following sets of ions, which one is not isoelectronic with the rest of the species?
EASY
The fundamental particles present in the nucleus of an atom are
EASY
Amongst the following statements, that which was not proposed by Dalton was :
EASY
The number of times the comparative mass of a neutron is heavier than an electron is:
EASY
The pair of atoms having the same number of neutrons is
EASY
In Millikan's oil drop experiment, the forces acting on the oil drop are?
MEDIUM

Electrons in a cathode ray tube have been emitted with a velocity of 1000 ms-1. The number of following statements which is/are true about the emitted radiation is

Given : h=6×10-34Js,me=9×10-31 kg

(A ) The deBroglie wavelength of the electron emitted is 666.67 nm

(B ) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube.

(C) The cathode rays start from cathode and move towards anode.

(D ) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube..

MEDIUM
Among the following, the correct statement about cathode ray discharge tube is

 
HARD

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Loss of electron from hydrogen atom results in nucleus of ~1.5×103 pm size.

Reason R: Proton H+ always exists in combined form.

In the light of the above statements, choose the most appropriate answer from the options given below:

EASY
The discovery of neutron becomes very late because
MEDIUM
Justify that the protons are the constituents of all atoms.
HARD
In Millikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is -1.282×10-18C, calculate the number of electrons present on it.
HARD
What happens when the cathode rays are passed separately through electric and magnetic fields? 
HARD
Calculate the number of electrons which will together weigh one gram.
HARD
What are the differences in the discharge tubes used to study cathode rays and anode rays?
MEDIUM
A certain particle carries 2.5×10-16 C of static electric charge. Calculate the number of electrons present in it.
EASY
Draw a labelled diagram showing the deflection of cathode rays in a magnetic field.
EASY
What happens when an electric field is applied to a stream of cathode rays? What conclusion can be drawn from this observation?