Nucleus: Introduction

Q. In the nucleus of helium if F1 is the net force between two protons, F2 if the net force between two neutrons and F3 is the net force between a proton and a neutron. Then Options: F1 = F2 = F3 F1 > F2 > F3 F2 > F3 > F1 F2 = F3 > F1

Q. the activity of a radioactive sample os measured as No counts per min at t=0 and No/e counts per min at t=5 mins. the time in min at which the activity reduces to half its value is

Q.

On February 27, 1932 James Chadwick published his conclusive findings about the elusive neutron. Below is a representation of the experimental setup he used. What are the missing parts of the puzzle?

1. i) alpha, ii) proton, iii) neutron

2. i) neutron, ii) alpha, iii) proton

3. i) proton, ii) neutron, iii) alpha

4. i) alpha, ii) neutron, iii) proton

Q. Charge of a neutron is zero.

1. False
2. True

Q. What is neutrino and antineutrino?

Q. In case of theory of light nature of light match the following :

List - I	List - II
a) Light is a collection of photons	e) Newton's theory
b) Light is a form of electromagnetic wave	f) Huygen's theory
c) Light is a wave	g) Maxwell's theory
d) Light is a stream of corpuscles	h) Max planck's theory

1. a-h; b-g; c-f; d-e
2. a-e; b-f; c-g; d-h
3. a-h; b-g; c-e; d-f
4. a-g; b-h; c-g; d-f

Q. The wave-like character was experimentally proved for light by

1. Newton
2. Huygens
3. Maxwell
4. Young

Q.

What were the observations that made us look for the existence of neutrons?

1. The fact that different nuclei have different mass.

2. The existence of forms of same element but with different mass (Isotopes).

3. Helium's atomic number was 2 but was 4 times heavier than Hydrogen.

4. The existence of Neutron star.

Q. The neutron was discovered by

1. James Chadwick
2. Pierree Curie
3. Rutherford
4. Marie Curie

Q. Charge of a neutron is zero.

1. False
2. True

Q.

What were the observations that made us look for the existence of neutrons?

1. The fact that different nuclei have different mass.

2. The existence of forms of same element but with different mass (Isotopes).

3. Helium's atomic number was 2 but was 4 times heavier than Hydrogen.

4. The existence of Neutron star.

Q. Who proposed wave nature of light ?

1. Young
2. Huygen
3. Fresnel
4. Maxwell

Q.

Why couldn't the mysterious rays coming out of Beryllium foil in Chadwick's experiment on being hit by alpha particles have been gamma rays?

1. Those rays were travelling in a straight line whereas gamma rays are diffused.

2. Gamma photons are massless so we can't expect them to hit and displace a heavier particle like proton with such high energy.

3. Those rays were not getting deflected by electric or magnetic field, unlike any other EM wave.

4. I surely didn't understand this part from the videos

Q.

On February 27, 1932 James Chadwick published his conclusive findings about the elusive neutron. Below is a representation of the experimental setup he used. What are the missing parts of the puzzle?

1. i) alpha, ii) proton, iii) neutron

2. i) neutron, ii) alpha, iii) proton

3. i) proton, ii) neutron, iii) alpha

4. i) alpha, ii) neutron, iii) proton

Q.

What were the observations that made us look for the existence of neutrons?

1. The fact that different nuclei have different mass.

2. The existence of forms of same element but with different mass (Isotopes).

3. Helium's atomic number was 2 but was 4 times heavier than Hydrogen.

4. The existence of Neutron star.

Q. Who first proposed the light as electromagnetic wave ?

1. James Clerk Maxwell
2. Thomas Young
3. Max planck
4. Albert Einstein

Q. How to solve neutron

Q.

On February 27, 1932 James Chadwick published his conclusive findings about the elusive neutron. Below is a representation of the experimental setup he used. What are the missing parts of the puzzle?

1. i) alpha, ii) proton, iii) neutron

2. i) neutron, ii) alpha, iii) proton

3. i) proton, ii) neutron, iii) alpha

4. i) alpha, ii) neutron, iii) proton

Q. In what respects is Huygens' wave theory of light similar to Maxwell's electromagnetic theory? In what respect are the two theories different?

Q.

Who discovered neutron experimentally?

Q. Solve this
1 Why is it found experimentally difficult to detect neutrinos in nuclear $\beta$decay?