Physics Test - ...

Standing waves are formed on a string when interference occurs between two waves having :

VA massless rod is suspended by two identical strings AB and CD of equal length. A block of mass mm is suspended from point O such that BO is equal to 'x'. Further, it is observed that the frequency of 1st harmonic (fundamental frequency) in AB is equal to 2nd harmonic frequency in CD. Then, length of BO is :

Progressive waves are represented by the equation y₁ = a sin (ωt − x) and y₂= b cos (ωt − x) . The phase difference between waves is :

A standing wave in a pipe with a length \(L=1.2 \mathrm{m}\) is described by

\(y(x, t)=y_{0} \sin [(2 \pi / L) x] \sin [(2(\pi / L) x+\pi / 4)] .\) Based on above information, which one of

the following statement is incorrect.

(Speed of sound in air is \(300 \mathrm{ms}^{-1}\) ).

A ripple is created in water. The amplitude at a distance of 5 cm from the point where the sound ripple was created is 4 cm. Ignoring damping, what will be the amplitude at the distance of 10 cm.

The equation of sound wave is y = 0.0015 sin (62.4x + 316t) . Find the wavelength of this wave :

It is possible to recognise a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice :

A sonometer consists of two wires of lengths 1.5m and 1m made up of different materials whose densities are 5g/cc and 8g/cc, and their respective radii are in the ratio 4:3. The ratio of tensions in these two wires, if their fundamental frequencies are equal is :

Two tuning forks when sounded together produce 6 beats/s. The first fork has the frequency 3% higher than a standard one and the second has the frequency 2% less than the standard fork. The frequencies for the forks are :