In order to effectively radiate a radio signal, an antenna must be at least one-half the wavelength of transmission in length, i. e., minimum antenna height = 1/2(λ). wity operates at a frequency of 980.0 khz. what is the minimum height (m) of the antenna that wity (nostalgia radio) must have? ,

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Rohit is trying to tune an instrument