A radar operates at a wavelength `lambda = 50.0 cm`. Find the velocity of an approaching aircraff if the beat frequency between the transmitted signal and the signal reflected form the aircraft is equal to `Deltav = 1.00 kHz` at the radar location.

A radar operates at wavelength 50.0 cm. If the beat frequency between the transmitted singal and the singal reflected from aircraft (Deltav) is 1 kHz, then velocity of the aircraft will be :

A radar operates at wavelength 50.0 cm. If the beat frequency between the transmitted singal and the singal reflected from aircraft (Deltav) is 1 kHz, then velocity of the aircraft will be :

Figure. Illustrates the interference axperiment with Fresnel mirrors. The angle between the mirrors is alpha = 12' the distance from the mirrors intersection line to the narrow slit S and the screen Sc are equal to r= 10.0 cm and b = 130 cm resoectively. the wavelength of light is lambda = 0.55 mu m . Find: (a) the width of a fringe on the screen and the number of possible maxima, (b) the shift of the interference pattern on the screen when the slit is displaced by del l = 1.0 mm along the are of radius r with centre at the point O , (c) at what maximum width del_(max) of the slit the interference fringes on the screen are still observed sufficiently sharp.

A thin horizontal disc of radius R=10cm is located with in a cylindrical cavity filled with oil whose viscosity eta=0.08 P (figure) The distance between the disc and the horizontal planes of the cavity is equal to h=1.0 mm find the power developed by the viscous forces acting ont he disc when it rotates with the angular velocity omega=60rad//s . The end effect are to be neglected.

A thin horizontal disc of radius R=10cm is located with in a cylindrical cavity filled with oil whose viscosity eta=0.08 P (figure) The distance between the disc and the horizontal planes of the cavity is equal to h=1.0 mm find the power developed by the viscous forces acting ont he disc when it rotates with the angular velocity omega=60rad//s . The end effect are to be neglected.

A thin horizontal disc of radius R=10cm is located with in a cylindrical cavity filled with oil whose viscosity eta=0.08 P (figure) The distance between the disc and the horizontal planes of the cavity is equal to h=1.0 mm find the power developed by the viscous forces acting ont he disc when it rotates with the angular velocity omega=60rad//s . The end effect are to be neglected.

A point source of light with wavelength lambda = 0.50mu m is located at a disatnce a = 100cm in front of a diaphragm with round aperture of radius r = 1.0 mm . Find the distance b between the diaphragm and the observation point for which the number of Fresnel zones in the aperture equals k = 3 .