W sin\(\theta\)
W cos\(\theta\)
W sec\(\theta\)
W tan\(\theta\)
Correct answer is A
horizontal component = W cos(90o - \(\theta\))
= W sin
Which of the following is the most suitable for use as an altimeter?
A mecury barometer
A fortin barometer
A mecury manometer
An aneroid barometer
Correct answer is D
No explanation has been provided for this answer.
\(^{27}_{13}Al\) + \(^{1}_{0}n\) \(\Rightarrow\) \(^{24}_{11}Na\) + 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.