Two sirens , situated at two places 1 km apart, are sounding with the same frequency, A man while moving along the road in between the two sirens heard beats . Explain .

Two (-ve) charge, each of magnitude q are situated at 2r distance apart. A (+ve) charge q is lying at the centre between them. The potential energy of the system is U_1 If the two nearest charges are mutually interchanged and the potential energy becomes U_2 then U_1/U_2 will be

Two roads AB and BC intersect at B, where angleABC = 60^(@) and bar(AB) = 28 meter. A cyclist starts from A and moves towaeds B at the rate of 4m/sec and at the same instant another cyclist starts from B and moves along the road BC at the rate of 8 m/sec. find the rate of change of distance between them 3 seconds.

If there by perfectly elastic collision between two bodies of the same mass moving along a straight line, the two bodies will

Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are +q and -q . The potential difference between the centres of the two rings is

The frequency of crossing over occurs between two genes located on the same chromosome depends on

The ratio of amplitude of two waves having the same frequency is 1:3. These two waves are superposed. Determine the ratio of the maximum and minimum intensities.

If two loci are 10 map units apart, assuming that no multiple cross-over has taken place, what proportion of the cells formed as a result of meiosis will contain a single crossover in the region between these two loci? a. 0.1 b. 0.2 c. 0.3 d. 0.4