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प्रश्न
Name the scientist who discovered radio waves
उत्तर
Marconi
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संबंधित प्रश्न
What role dose infra-red radiation play in maintain the Earth’s warmth
If the earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
Why are infra-red waves often called heat waves? Explain.
When 40 kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of 9.7 × 1018 Hz. Calculate the value of Planck constant from these data.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name the scientist who discovered Ultraviolet rays
Answer the following question.
Gamma rays and radio waves travel with the same velocity in free space. Distinguish between them in terms of their origin and the main application.
A bat moving at 10 ms−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms−1)
Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.
Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.
Name one radiation having the wavelength longer than the wavelength of these radiations.
