Advertisements
Advertisements
प्रश्न
Identify the part of the electromagnetic spectrum used in
(i) radar and
(ii) eye surgery. Write their frequency range.
Advertisements
उत्तर
The microwave range of the electromagnetic spectrum with frequency range 1.6 to 300 GHz and wavelength range 187 to 10 mm are used in operating radar and ultraviolet range with frequency 8 x 1014 Hz to 3 x 1016 Hz and wavelength 400 nm to 10 nm are used in eye surgery.
APPEARS IN
संबंधित प्रश्न
What role dose infra-red radiation play in maintain the Earth’s warmth
Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.
(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).
(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).
(c) 2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe].
(d) 5890 Å - 5896 Å [double lines of sodium]
(e) 14.4 keV [energy of a particular transition in 57Fe nucleus associated with a famous high resolution spectroscopic method (Mössbauer spectroscopy)].
A wave has wavelength 50 Å.
- Name the wave.
- State its speed in vacuum.
- State its one use.
What is the range of the wavelength of the following electromagnetic waves?
(a) Visible.
What is the range of the wavelength of the following electromagnetic waves?
(a) Micro waves .
Give the range of wavelength of the electromagnetic waves visible to us.
Give one use of ultraviolet radiation.
Can X-rays be used for photoelectric effect?
Answer briefly.
Does an ordinary electric lamp emit EM waves?
Identify the electromagnetic wave whose wavelength range is from about 10-12 m to about 10-8 m. Write one use of this.
