Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
photoelectric emission
thermionic emission
radioactive emission
Held emission
secondary emission
Correct answer is B
No explanation has been provided for this answer.
I only
II only
III only
II and III only
I, II and III
Correct answer is D
No explanation has been provided for this answer.
experimental error in calculating the separate masses
change of momentum of each fragment
potential energy lost
nuclear energy released
kinetic energy lost
Correct answer is D
No explanation has been provided for this answer.
An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years
1 N atoms8
1 N atoms3
2 N atoms3
5 N atoms6
7 N atoms8
Correct answer is E
\(\frac{N}{3}\) = 3years
\(\frac{N}{4}\) = 6years
\(\frac{N}{8}\) = 9years
N - \(\frac{N}{8}\) = \(\frac{7N}{8}\)
Which of the following gives rise to the line spectra obtained from atoms?
Kinetic energy of a moving atom
Potential energy of an electron inside an atom
Change of an electron from a higher to a lower energy level in the atom
Disturbed proton in the nucleus
Excitation of an electron in the atom
Correct answer is C
No explanation has been provided for this answer.