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.
The minimum energy required to remove an electron from an atom is known as
excitation energy
ionization energy
binding energy
photon energy
Correct answer is B
No explanation has been provided for this answer.
A radioactive element has a decay constant of 0.077s-1, calculate its half life
12.5s
9.0s
5.1s
0.5s
Correct answer is B
T = \(\frac{0.692}{\lambda} = \frac{0.692}{0.077}\)
= 9s
Which of the following statements is true of ultra violet radiations? It
supports the sensation of hearing
does not cause the emission of electrons from metals
is an electromagnetic wave
is not capable of causing sun burns
Correct answer is C
No explanation has been provided for this answer.
Which of the following statements is not true of the isotopes of an element? They
are atoms of the same element
have the same chemical properties
have the same atomic number
have the same mass number
Correct answer is D
No explanation has been provided for this answer.
Which of the following statements about an electromagnet is not correct?
it is a temporary magnet
its strength depends on the current
its stength depends on the number of turns in its coil
it has permanent poles
Correct answer is D
properties of an electromagnet include, 1) its strength depends on current and the number of turns in the coil,2) it is temporary, 3)it does not have permanent poles, and 4) its direction of flow is determined by the direction of current flowing through the coil.