1
AIEEE 2005
+4
-1
When two tuning forks (fork $$1$$ and fork $$2$$) are sounded simultaneously, $$4$$ beats per second are heated. Now, some tape is attached on the prong of the fork $$2.$$ When the tuning forks are sounded again, $$6$$ beats per second are heard. If the frequency of fork $$1$$ is $$200$$ $$Hz$$, then what was the original frequency of fork $$2$$ ?
A
$$202$$ $$Hz$$
B
$$200$$ $$Hz$$
C
$$204$$ $$Hz$$
D
$$196$$ $$Hz$$
2
AIEEE 2005
+4
-1
Out of Syllabus
An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency ?
A
$$0.5\%$$
B
zero
C
$$20\%$$
D
$$5\%$$
3
AIEEE 2004
+4
-1
The displacement $$y$$ of a particle in a medium can be expressed as, $$y = {10^{ - 6}}\,\sin$$ $$\left( {100t + 20x + {\pi \over 4}} \right)$$ $$m$$ where $$t$$ is in second and $$x$$ in meter. The speed of the wave is
A
$$20\,\,m/s$$
B
$$5\,m/s$$
C
$$2000\,m/s$$
D
$$5\,\pi \,m/s$$
4
AIEEE 2003
+4
-1
A metal wire of linear mass density of $$9.8$$ $$g/m$$ is stretched with a tension of $$10$$ $$kg$$-$$wt$$ between two rigid supports $$1$$ metre apart. The wire passes at its middle point between the poles of a permanent magnet, and it vibrates in resonance when carrying an alternating current of frequency $$n.$$ The frequency $$n$$ of the alternating source is
A
$$50$$ $$Hz$$
B
$$100$$ $$Hz$$
C
$$200$$ $$Hz$$
D
$$25$$ $$Hz$$
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