Advertisements
Advertisements
प्रश्न
Name the radiations of wavelength just longer than 8 × 10-7m.
Advertisements
उत्तर
Infrared radiations are longer than 8 × 10-7m = `(8 xx 10^-7)/(10^-10)` = 8000 Å
APPEARS IN
संबंधित प्रश्न
To which part of electromagnetic spectrum does a wave of frequency 3 × 1013 Hz belong?
The energy of a photon of a characteristic X-ray from a Coolidge tube comes from
-
- Calculate the speed of the wave.
- Name the medium through which it is traveling.
Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.
Identify the part of the electromagnetic spectrum used in
(i) radar and
(ii) eye surgery. Write their frequency range.
Answer briefly.
What is a carrier wave?
If the Earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
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)
Electromagnetic waves of wavelengths λ1, λ2 and λ3 are used in a radar system, in water purifiers and in remote switches of TV, respectively.
- Identify the electromagnetic waves.
- Write one source for each of them.
Identify the electromagnetic wave whose wavelength range is from about 10-3 m to about 10-1 m. Write one use of this.
