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.
\(^{27}_{13}Al\) + \(^{1}_{0}n\) \(\Rightarrow\) \(^{24}_{11}Na\) + X
a proton
a gamma ray
a helium particle
an alpha particle
Correct answer is D
\(^{27}_{13}Al\) + \(^{1}_{0}n\) \(\Rightarrow\) \(^{24}_{11}Na\) + \(^{b}_{a}X\)
a + 11 = 0 + 13 \(\Rightarrow\) a = 2
b + 24 = 1 + 27 \(\Rightarrow\) b = 4
\(^{b}_{a}X\) = \(^{4}_{2}\alpha\)
After three half lifes, the fraction of a radioactive material that has decayed is
\(\frac{1}{8}\)
\(\frac{1}{3}\)
\(\frac{2}{3}\)
\(\frac{7}{8}\)
Correct answer is D
I = \(\frac{1}{2}\) \(\Rightarrow\) \(\frac{1}{4}\) \(\Rightarrow\) \(\frac{1}{8}\)
Fraction decayed = 1 - \(\frac{1}{8}\)
= \(\frac{7}{8}\)
The threshold of frequency for photoelectric effect depends on the
intensity of incident light
frequency of incident light
material of the photocathode
potential difference between the cathode and the anode
Correct answer is C
No explanation has been provided for this answer.
Io = \(\frac{I_rms}{\sqrt{2}}\)
Irms = \(\frac{I_o}{\sqrt{2}}\)
Irms = \(\frac{\frac{I}{I_o}}{\sqrt2}\)
Irms = \(\frac{I_rms}{\sqrt{2}}\)
Correct answer is B
No explanation has been provided for this answer.
volt, ampere and hertz
ohms, volt and hertz
watt, ohms and radian
ohms, hertz and joule
Correct answer is B
No explanation has been provided for this answer.