History of the Atom

Q.

What is the rest mass energy of an electron?

1. 1 eV

2. 0.51 MeV

3. 931 MeV

4. none of these

Q. when an electron in hydrogen atom absorb a photon of energy 12.75eV its angular momentum increases b

Q.

In hydrogen atom the angular momentum of the electron in the lowest energy state is

1. 

2. 

3. 

4. 2h

Q. A free proton and a free alpha particle initially at separation of 1 A0 are released. the kinetic energy of proton and that of alpha particle when at infinite separation bear ratio.

Q.

Describe Thomsons plum pudding model. Which subatomic particle was not present in this model of the atom.

Q. Nucleus occupies most of the space in an atom.

1. True
2. False

Q. Kinetic energy of protons inside atom is kinetic energy of electrons in an atom.

1. greater than
2. less than
3. equal to

Q. A cyclotron can accelerate

1. neutrons
2. $\alpha$-particles
3. high velocity $\gamma$-particles
4. high velocity $\text{x-}$rays

Q.

As we know, Rutherford had directed the 1909 Geiger-Marsden experiment to test if Thomson's plum-pudding model was correct or not. What would be the plum-pudding model's predictions about the gold foil experiment? (Alpha particles are doubly ionized Helium atoms, denoted as $\alpha$ or ${\alpha }^{2+}$.)

1. The particles would get embedded into the atoms.
2. The particles would bounce back from the gold foil due to electrical repulsion.
3. The particles would pass through the gold foil with no or very less deflection.
4. Some of the particles would go right through, while a small number would get deflected at large angles.

Q. The kinetic energy of electron in 4 orbit

Q. If the kinetic energy of a proton gets doubled, then the de broglie wavelengths associated with it change by a factor

Q. What is the difference in the atomic models of Thomson and Rutherford?

Q. Rest mass energy of an electron is 0.54 $MeV$. If velocity of the electron is $0.8c$, then kinetic energy of the electron is

1. 0.36 $MeV$
2. 0.41 $MeV$
3. 0.48 $MeV$
4. 1.32 $MeV$

Q.

The splitting of line into groups under the effect of electric or magnetic field is called

1. Zeeman's effect

2. Bohr's effect

3. Heisenberg's effect

4. Magnetic effect

Q. A free proton and a free alpha particle initially at separation of 1 A0 are released. the kinetic energy of proton and that of alpha particle when at infinite separation bear ratio.

Q. An atom has a nearly continuous mass distribution in Thomson’s model but has a highly non-uniform mass distribution in Rutherford’s model.

1. True
2. False

Q. Rutherford was the first physicist to carry artificial transmutation from one element into another. In his experiment he bombarded nitrogen with alpha particles to produce isotope of.

1. Hydrogen
2. Carbon
3. Oxygen
4. Helium

Q. Nucleus occupies most of the space in an atom.

1. True
2. False

Q. Kinetic energy of protons inside atom is kinetic energy of electrons in an atom.

1. greater than
2. less than
3. equal to

Q. Which is true in case of the closest approach when $\alpha -$particles are targeted at an atom?

1. The whole of the kinetic energy of $\alpha -$particles converts into electrostatic potential energy.
2. The part of the kinetic energy of $\alpha -$particles converts into electrostatic potential energy.
3. The whole of the kinetic energy of $\alpha -$particles converts into heat energy.
4. The part of the kinetic energy of $\alpha -$particles converts into electrostatic potential energy and remaining into heat energy.

Q. According to Thomson's model, atoms are indestructible particles.

1. True
2. False

Q. A cyclotron can accelerate

1. neutrons
2. $\alpha$-particles
3. high velocity $\gamma$-particles
4. high velocity $\text{x-}$rays

Q. Choose the correct alternatives from the clues given at the end of the each statement:
An atom has a nearly continuous mass distribution in a ............. but has a highly non-uniform mass distribution in.
(Thomson's model / Rutherford's model)

Q. According to Thomson's model, atoms are indestructible particles.

1. True
2. False

Q.

Thomson model proposed which of the following:

1. An atom consists of a positively charged cloud with negative charges embedded in it.

2. An atom consists of a negatively charged cloud with positive charges embedded in it.

3. An atom is a cloud of positive and negative charges

4. It did not discuss the distribution of charges in the atom

Q. An atom has a nearly continuous mass distribution in Thomson’s model but has a highly non-uniform mass distribution in Rutherford’s model.

1. True
2. False

Q. I have a doubt regarding the concept in electrostatic
1) it is known that charges electrons repulsions all happen in the atomic level and we all know that there is a large amount of empty space present in atom because the size of atom is much greater than the size of and nucleus so if if lot of space in atom is empty and if the repulsions and attractions happen on charges then how is it how is that the medium is going to affect the attractions or repulsion because everything is having atom molecular or atomic level
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Q. In 1909, __________ discovered nucleus in his famous gold foil experiment.

1. Rutherford
   
2. J.J.Thompson
3. None of the above
4. Goldstein