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What are radio waves? Give its two uses. 

Important Questions on Spectra

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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
Why are infra-red waves often called heat waves ? Explain.
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
Name the electromagnetic radiations used for eye surgery.
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves

Write the following radiations in the ascending order of their frequencies :

Microwaves, Ultraviolet rays, X-rays and infrared rays.

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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
A carrot looks orange in colour because of the β carotene molecule in it. This means that the β carotene molecule absorbs light of wavelengths,
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
In visible light wavelength of _____ colour is minimum. 
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
Which mode of propagation is used by short wave broadcast services ?
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves

Name the portion of the electromagnetic spectrum in between ultraviolet and infrared regions.

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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong?
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves

Consider the following
(i) Submarine communications
(ii) A.M. radio
(iii) Shortwave ratio
(iv) Radar

Arrange the above in increasing frequency of the waves associated with them

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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
Which of the following statements is false?
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
The E.M. wave with shortest wavelength among the following is
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves

State any one use of infrared radiations.

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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
The order of wavelength of visible rays is
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves

State any one source of ultraviolet radiations.

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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves

Write the following radiations in the ascending order of their wavelengths:

Microwaves, Ultraviolet rays, Gamma rays, Infrared rays

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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
How Gamma Rays are produced? Write its two important uses. 
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Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
The speed of X-rays is the same as that of visible light. Hence its wavelength is
HARD
Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
The correct representation of wavelength intensity relationship of an ideal black body radiation at two different temperatures T1 and T2 is
MEDIUM
Physics>Physics of Waves>Spectra>Uses of Electromagnetic Waves
An electromagnetic radiation is used for photography in fog.
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose?