1
AIEEE 2008
+4
-1
While measuring the speed of sound by performing a resonance column experiment, a student gets the first resonance condition at a column length of $$18$$ $$cm$$ during winter. Repeating the same experiment during summer, she measures the column length to be $$x$$ $$cm$$ for the second resonance. Then
A
$$18 > x$$
B
$$x > 54$$
C
$$54 > x > 36$$
D
$$36 > x > 18$$
2
AIEEE 2008
+4
-1
A wave travelling along the $$x$$-axis is described by the equation $$y(x, t)=0.005$$ $$\cos \,\left( {\alpha \,x - \beta t} \right).$$ If the wavelength and the time period of the wave are $$0.08$$ $$m$$ and $$2.0s$$, respectively, then $$\alpha$$ and $$\beta$$ in appropriate units are
A
$$\alpha = 25.00\pi ,\,\beta = \pi$$
B
$$\alpha = {{0.08} \over \pi },\,\beta = {{2.0} \over \pi }$$
C
$$\alpha = {{0.04} \over \pi },\,\beta = {{1.0} \over \pi }$$
D
$$\alpha = 12.50\pi ,\,\beta = {\pi \over {2.0}}$$
3
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
$$10$$
4
AIEEE 2006
+4
-1
Out of Syllabus
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
$$30\,\,m{s^{ - 1}}$$
EXAM MAP
Medical
NEET