What should be the amplitude of the interfering beams to produce a completely dark fringe? Why?

What should be the properties of the medium for producing sound waves ?

What should be the minimum size of a plane mirror to produce full image of a persono having height h?

A beam of light of wavelength 600 nm from a distant source falls on a single slit 1.00 mm wide and the resulting diffraction pattern is observed on a screen 2m away. What is the distance between the first dark fringes on either side of the central fringe?

In a Young's experiment,two coherent sources are placed 0.9 mm apart and the fringes are observed 1 m away.If it produces the second dark fringe at a distance of 1 mm from the central fringe,the wavelength of monochromatic ligth used would be

Why should we have narrow sources to produce good interference fringes?

We have read in this chapter that there are four main stakeholders when it comes to forests and wild-life, which among these should have the authority to decide the management of forest produce?Why do you think so?

A farmer mixes two brands P and Q of cattle feed. Brand P, costing Rs 250 per bag, contains 3 units of nutritional element A, 2.5 units of element B and 2 units of element C. Brand Q costing Rs 200 per bag contains 1.5 units of nutritional element A, 11.25 units of element B and 3 units of element C. The minimum requirements of nutrients A,B and C are 18 units, 45 units and 24 units respectively. Determine the number of bags of each brand which should be mixed in order to produce a mixture having a minimum cost per bag? What is the minimum cost of the mixture per bag?