Yes. Many varieties of computers are "noisy" in the radio spectrum, to the point where a receiver in the next room can read what you type.
Beyond that, the monitor certainly emits light waves; otherwise, how would you see the screen? The CPU fan emits sound waves, unless you are very fortunate.
That would be called a "pulsar". See related question
the lenght of the waves , strenght of the waves and the duration o the high waves determine how high the waves in a place will be
It depends on the particular LED. Some of them emit infrared light. But, yes, emission occurs when forward-biased.
they start at a earthquake.
The parabolic shape is a special concave reflecting surface that concentrates wave energy. It is used to collect the parallel waves from an extremely distant source. There is a special location called the focal point where the wave receiver (detector) is placed. Waves arriving from any other direction (angle) will concentrate away from this receiver and are ignored. You can also emit energy at the focal point. The reflected energy will stay concentrated (parallel) over extreme distances.
Light waves do not emit radiation, light waves are radiation.
Classical they will emit electromagnetic waves (light and radio waves). Quantum effects might limit this since if the electrons are in the ground state (or all lower states are occupied) they can not emit any photons (quanta of electromagnetic waves).
dose scientific calculator emit sinewaves
Tsunamis
They emit: gamma rays, radio waves, and x-rays. Some stars emit T.V. rays
Through Radiation
yes
it is a (n) pulsar
yeah, that and radio waves
No. Only those carrying AC. Those carrying DC have a constant magnetic field around them and emit no waves.
Black holes emit a great deal of x-ray energy.
Well, yes. They couldn't work if they didn't emit electromagnetic radiation in the form of radio waves.