1
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?
A
20 Hz
B
30 Hz
C
40 Hz
D
10 Hz
2
NEET 2017
MCQ (Single Correct Answer)
+4
-1
Change Language
A physical quantity of the dimensions of length that can be formed out of c, G and $${{{e^2}} \over {4\pi {\varepsilon _0}}}$$ is [c is velocity of light, G is the universal constant of gravitation and e is charge]
A
$${c^2}{\left[ {G - {{{e^2}} \over {4\pi {\varepsilon _0}}}} \right]^{1/2}}$$
B
$${1 \over {{c^2}}}{\left[ {{{{e^2}} \over {G\,4\pi {\varepsilon _0}}}} \right]^{1/2}}$$
C
$${1 \over c}G{{{e^2}} \over {\,4\pi {\varepsilon _0}}}$$
D
$${1 \over {{c^2}}}{\left[ {G{{{e^2}} \over {\,4\pi {\varepsilon _0}}}} \right]^{1/2}}$$
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