Atomic & Nuclear Phenomena

Question 1

The min frequency of light that causes ejection of e-‘s is known as what ?

Answer 1

Threshold frequency (fT)

Question 2

The result of matter being converted to energy is termed ?

The difference btwn the predicted & actual masses of the nucleus is known as ?

Answer 2

Mass defect

Question 3

What does atomic number & mass number correspond to respectively ?

Answer 3

AN: protons
MN: protons & neutrons

Question 4

What is the process of small nuclei combining to form large nucleus called ?

Answer 4

Fusion

Question 5

The process by which a large nucleus splits into small nuclei is known as ?

Answer 5

Fission

Question 6

Alpha decay is the emission of which particle ?

Answer 6

Alpha

*massive compared to beta & carries double charge

Question 7

Induced decay is referred to as ?

Answer 7

Positron emission: mass of an e- but carries + charge

e+ or B+ symbol

Question 8

The emission of gamma rays (high energy, high frequency photons) is known as ?

Answer 8

Gamma decay

*no charge, just lower parent energy

Question 9

The time it takes for half the sample to decay is termed ?

Answer 9

Half-life

Question 10

Protons & neutrons come together to form the nucleus by means of what type of attraction ?

Answer 10

Strong nuclear force (acts over short distances)

Strong enough to overcome electrostatic force between like forces

Question 11

The energy needed to form & split up the nucleus respectively is known as ?

Answer 11

Binding energy