A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of sound. What is the time interval between successive compressions from the source ?

What is the minimum distance of the obstacle from the source of sound for hearing distinct echo ?

A transverse harmonic wave on a string is described by y(x. t) = 3.0 sin (36 t + 0.018 x + (pi//4)) where x and y are in cm and tin s. The positive direction of x is from left to right. What is the least distance between two successive crests in the wave ?

Fig.110 shows a capacitor made of two circular plates each of radius R=12 cm and separated by 5 cm.The capacitor is being charged by an external source (not shown in the figure).Use modified Ampere's circuital law to determine magnetic field at the point P at a distance of 0.5 m from the centre of the plats in the plane midway between them,when the chargingg current is 2A? .

A capacitro is made of two circular plates each of radius 0*25 m [Fig 1.09] .It is being charged by an external source.What is the magnetic field at a piont P at adistnce of 0.5 m from the entre of the plates in the plane midway between them,when the charging current is 1 A? .

Two radio stations broadcast their programmes at the same amplitude A and at slightly different frequencies omega_1 adn omega_2 respectively, where omega_1-omega_2 = 10^(13) Hz. A detector receives the signals from the two stations simultaneously. It can detect signals of intensity ge2A^2 . Find the time interval between successive maxima of the intensity of the signal received by the detector.

The instantaneous current from an a.c. source is i=0.5 sin 314 t. What is the r.m.s value.

What is the potential gradient ( in Vm^-1 ) at a distance o 10^-12 m from the centre fo the platinum nucleus? What is the potential gradient at the surface of nucleus? Atomic number of platinum is 78 and the radius of platinum nucleus may be taken as 5 xx 10^-15 m.

A hill is 500 m high. Supplies are to be sent across the hill using a canon that can hurl packets at a speed of 125 m//s over the hill. The canon is located at a distance of 800m from the foot of hill and can be moved on the ground at ba speed of 2 m//s, so that its distance from the hill can be adjusted. What is the shortest time in which a packet can reach on the ground across the hill? Take g= 10 m//s^(2) .