1
AIEEE 2009
+4
-1
Three sound waves of equal amplitudes have frequencies $$\left( {v - 1} \right),\,v,\,\left( {v + 1} \right).$$ They superpose to give beats. The number of beats produced per second will be :
A
$$3$$
B
$$2$$
C
$$1$$
D
$$4$$
2
AIEEE 2009
+4
-1
Out of Syllabus
A motor cycle starts from rest and accelerates along a straight path at $$2m/{s^2}.$$ At the starting point of the motor cycle there is a stationary electric siren. How far has the motor cycle gone when the driver hears the frequency of the siren at $$94\%$$ of its value when the motor cycle was at rest? (Speed of sound $$= 330\,m{s^{ - 1}}$$)
A
$$98$$ $$m$$
B
$$147$$ $$m$$
C
$$196\,m$$
D
$$49$$ $$m$$
3
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
$$36 > x > 18$$
4
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
$$\alpha = 12.50\pi ,\,\beta = {\pi \over {2.0}}$$
EXAM MAP
Medical
NEET