Advertisements
Advertisements
प्रश्न
-
- Calculate the speed of the wave.
- Name the medium through which it is traveling.
Advertisements
उत्तर
a. We know that,
v = f λ
Here it is given that c = 3 × 108 m/s
and, f = 500 MHz = 500 × 106 Hz
λ = 60 cm = 0.6 m
∴ v = (500 × 106 ) × (0.6) = 3 × 108 m/s
which is the same as the velocity of the e-m wave in vacuum or air.
b. The medium through which it is travelling is either air or vacuum.
संबंधित प्रश्न
What role dose infra-red radiation play in physical therapy?
Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals
Why are infra-red waves often called heat waves? Explain.
Name the region beyond the violet end of the spectrum called.
Which part of electromagnetic spectrum is used in radar systems?
The wavelength of Kα X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell of a tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having tungsten target which allows production of Kα X-ray?
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name two sources of ultraviolet radiation.
Name two sources of infrared radiation.
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
What happens when an electron collides with a positron?
