1
AIEEE 2007
+4
-1
A sound absorber attenuates the sound level by $$20$$ $$dB$$. The intensity decreases by a factor of
A
$$100$$
B
$$1000$$
C
$$10000$$
D
$$10$$
2
AIEEE 2006
+4
-1
A whistle producing sound waves of frequencies $$9500$$ $$Hz$$ and above is approaching a stationary person with speed $$v$$ $$m{s^{ - 1}}.$$ The velocity of sound in air is $$300\,m{s^{ - 1}}.$$ If the person can hear frequencies upto a maximum of $$10,000$$ $$HZ,$$ the maximum value of $$v$$ upto which he can hear whistle is
A
$$15\sqrt 2 \,\,m{s^{ - 1}}$$
B
$${{15} \over {\sqrt 2 }}\,m{s^{ - 1}}$$
C
$$15\,\,m{s^{ - 1}}$$
D
$$30\,\,m{s^{ - 1}}$$
3
AIEEE 2006
+4
-1
A string is stretched between fixed points separated by $$75.0$$ $$cm.$$ It is observed to have resonant frequencies of $$420$$ $$Hz$$ and $$315$$ $$Hz$$. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is
A
$$105$$ $$Hz$$
B
$$1.05$$ $$Hz$$
C
$$1050$$ $$Hz$$
D
$$10.5$$ $$Hz$$
4
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
$$196$$ $$Hz$$
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