What should be the order of magnitude of the minimum fequency of electromagnetic waves that could be used to detect the presence of
an aircraft 50 m long and

What should be the order of magnitude of the minimum fequency of electromagnetic waves that could be used to detect the presence of a bird 0.1m long? From what sources of electromagnetic radiation would you be able to generate radiation of these wavelengths?

What should be the order of magnitude of the minimum frequency of electromagnetic waves that could be used to detect the presence of the planet venus.

What are the uses of electromagnetic waves?

Electromagnetic spectrum Electromagnetic waves are coupled time varying electric and magnetic fields, propagating in space, with the speed very close to that of light (3xx10^8 ms^-1) . An the orderly distribution and classification of electromagnetic waves according to their frequency or wavelength is called electromagnetic spectrum. electromagnetic waves inclued visible light, ultraviolet waves, infra red waves, X-rays, gamma-rays, microwaves and radiowaves. The electromagnetic waves used in surgery for detection of fractures, diseased organs, forensic matter like bullet, etc, are

What should be the refacting anle of a prism of refractie index 1.5 in order that the ray incident on the face at an angle of 50^@ may suffer inimum deviation.

A fruit grower can use two types of fertilizer in his garden, brand P and brand Q. The amounts (in kg) of nitrogen, phosphoric acid, potash, and chlorine in a bag of each brand are given in the table. Tests indicate that the garden needs at least 240 kg of phosphoric acid, at least 270 kg of potash and at most 310 kg of chlorine. If the grower wants to minimise the amount of nitrogen added to the garden, how many bags of each brand should be used? What is the minimum amount of nitrogen added in the garden? If the grower wants to maximize the amount of nitrogen added to the garden, how many bags of each brand should be added? What is the maximum amount of nitrogen added?

A person cannot see object beyond 1.5 m distinctly . What type of lens should be used to restore proper vision?

A steel wire has a length of 12.0 m and a mass of 2.10 kg. What should be the tension in the wire so thatspeed of a transverse wave on the wire equalsthe speed of sound in dry air at 20 ^@C = 343 m s^-1 .

The temperature of a city was found to be -9.3^(@) C. A car used, whose rasiator was filled with 5 L of water . What minimum quantity of antifreezing agent ethylene glycol were added to water of raiator in order to use the car for teavelling? ( K_(f) of water 1.86 k mol^(-1))

Three point charges of +2muC ,-3muC and -3muC are kept at the vertices A, B and C respectivel of an equilaterla triangle of side 20 cm. What should be the sign and magnitude of the charge to be placed at the mid-point M of side BC, so that the charge at A remains in equilibrium?