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प्रश्न
Name the scientist who discovered radio waves
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उत्तर
Marconi
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संबंधित प्रश्न
Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?
What is the range of the wavelength of the following electromagnetic waves?
(a) Infrared.
Name the region beyond the violet end of the spectrum called.
Name the waves used for taking photographs in dark.
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.name the medium through which it is travelling
The electric current in an X-ray tube (from the target to the filament) operating at 40 kV is 10 mA. Assume that on an average, 1% of the total kinetic energy of the electron hitting hte target are converted into X-rays.
(a) What is the total power emitted as X-rays and (b) how much heat is produced in the target every second?
State two properties of infrared radiations which differ from visible light.
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
Which is the correct ascending order of wavelengths?
Which one of the following electromagnetic radiation has the least wavelength?
