Gamma rays are:
High energy electrons
Low energy electrons
High energy electromagnetic radiations
High energy positrons
The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?
The scientist who named cathode ray particle as electron :
J.J.Thomson
G.J..Stoney
Rutherford
Dalton
The mass of electron was ______________ .
9.10 x 10-28 gm
9.10 x1028 gm
8 .10 x10-28 gms
9.10 x1010 gms
Thomson's atom model is known as __________ .
planetary model
plum pudding model
plannar model
none of these
Neutrons possess ___________ charge .
neutral
positive
negative
Which of the following have no mass or charge ?
Alpha particles
Beta particles
Protons
Gamma rays
Rutherford's alpha ray scattering experiments did not provide any information about __________ .
charge on the nucleus of an atom .
size of the nucleus.
arrangement of sub atomic particles .
none of these.
Rutherford's α- particles scattering experiment showed that
(i) atoms are spherical in shape and mostly hollow .
(ii)atom is stable
(iii) the electrons are seen inside the nucleus .
(iv) electrons revolve around the nucleus ,like planets around the sun .
(i) and (iv)
(ii) and (iii)
(ii)
(iii)
Which of the following is not an electromagnetic radiation?
Infrared rays
X-rays
cathode rays
