Two vertical poles are at distance of 6.28 m from each other , what should the maximum distance of an observer from poles to see them separately.

Two protons are a distance of 1 xx 10^(-10) cm from each other. The force acting on them are

An aeroplane is flying over two houses which are at a distance of 300 m from each other. If at some moment from the aeroplane the angle of depression of two houses on the same side are 45^(@)" and "60^(@) , at what height the plane is flying ?

An oscillator of frequency 680 Hz drives two speakers . The speakers are fixed on a vertical pole at a distance 3 m from each other as shown in Fig. 7.103. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that there is no reflection of sound from the ground and speed of sound is v = 340 m//s , answer the following questions. How far is the person from the pole when he hears a minimum in sound intensity a second time ?

An oscillator of frequency 680 Hz drives two speakers . The speakers are fixed on a vertical pole at a distance 3 m from each other as shown in Fig. 7.103. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that there is no reflection of sound from the ground and speed of sound is v = 340 m//s , answer the following questions. As the person walks towards the pole , his distance from the pole when he first hears a minimum in sound intensity is nearly

An oscillator of frequency 680 Hz drives two speakers . The speakers are fixed on a vertical pole at a distance 3 m from each other as shown in Fig. 7.103. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that there is no reflection of sound from the ground and speed of sound is v = 340 m//s , answer the following questions. As the person walks toward the pole , the total number of times that the person hears a minimum in sound intensity will be

Two ball with charges 5muC and 10muC are at a distance of 1 m from each other. In order to reduce the distance between them to 0.5 m , the amount of work to be performed is

An oscillator of frequency 680 Hz drives two speakers . The speakers are fixed on a vertical pole at a distance 3 m from each other as shown in Fig. 7.103. A person whose height is almost the same as that of the lower speaker walks towards the lower speaker in a direction perpendicular to the pole. Assuming that there is no reflection of sound from the ground and speed of sound is v = 340 m//s , answer the following questions. At some instant , when the person is at a distance 4 m from the pole , the wave function ( at the person's location) that describes the waves coming from the lower speaker y = A cos (kx - omega t) , where A is the amplitude , omega = 2 pi v with v = 680 Hz (given) and k = 2 pi//lambda Wave function ( at the person's location) that describes waves coming from the upper speaker can be expressed as :

Two coherent light sources A and B are at a distance 3lambda from each other (lambda =wavelength)The distances from A on the X-axis at which the interference is constructive are

An object is placed at a distance f in the front of a convex mirror. If focal length of the mirror is f, then distance of image from pole of the mirror is

Two charges spheres are separated at a distance d exert a force F on each other, if charges are doubled and distance between them is doubled then the force is