Waves Test - 29...

The vibrations of four air columns are represented in Fig. the ratio of frequencies n_p : n_q : n_r : n_s is

If λ₁ : λ₂ : λ₃ are the wavelengths of the waves giving resonance with the fundamental, first and second overtones respectively of a closed organ pipe, then the ratio of λ₁ : λ₂ : λ₃ is

In kundt’s tube, length of an iron rod is 1 m. The stationary waves of frequency 2500 hz are produced in it. The velocity of sound in iron is

A tuning fork of frequency n is sounded at the open end of a long cylindrical tube having a side opening and fitted with a movable reflection piston. On moving the piston through 9 cm, the intensity of sound heard by the listener changes from max. to minimum. If speed of sound is 360 m/s value of n is

To an observer moving towards a stationary source, the tone emitted by a source appears to be an octave higher. If V is the speed of sound wave, then the velocity of observer is

A sound source of frequency 170 hz is placed near a wall. A man walking from the source normally towards the wall finds that there is periodic rise and fall of sound intensity. If speed of sound in air is 340 m/se, the distance in metres separating the two adjacent position of minimum intensity is

A vehicle, with a horn of frequency n is moving with a velocity of 30 m/s in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency (n + n₁). If the sound vel. In air is 300 m/s, then

A racing car moving towards a cliff sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If V = the velocity of sound, the velocity of the car is

The stationary wave y = 2 a sin K x cos wt in a closed organ pipe is the result of the superposition of y₁ = a sin(ωt + Kx ) and

At a certain instant, a stationary transverse wave is found to have maximum kinetic energy. The appearance of the string at that instant is