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Answer briefly. Does an ordinary electric lamp emit EM waves? - Physics

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प्रश्न

Answer briefly.

Does an ordinary electric lamp emit EM waves?

एका वाक्यात उत्तर

उत्तर

Yes, an ordinary electric lamp emits EM waves.

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पाठ 13: Electromagnetic Waves and Communication System - Exercises [पृष्ठ २४०]

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बालभारती Physics [English] 11 Standard Maharashtra State Board
पाठ 13 Electromagnetic Waves and Communication System
Exercises | Q 2. (vi) | पृष्ठ २४०

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संबंधित प्रश्‍न

How are infrared waves produced?


Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.


If the earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.


To which part of the electromagnetic spectrum does a wave of frequency 5 × 1011 Hz belong?


(a) Give a list of at least five radiations, in order of their increasing frequencies, which make up the complete electromagnetic spectrum.

(b) Which of the radiation mentioned by you in part (a) has the highest penetrating power.


What is the range of the wavelength of the following electromagnetic waves?
(a) Gamma rays.


What is the range of the wavelength of the following electromagnetic waves?

(a) Ultraviolet


Name the radiations of wavelength just longer than 8 × 10-7m.


Name the radiations of wavelength just shorter than 4 × 10-7 m.


Name the rays or waves  of highest frequency .


In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?


X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?


Can Lα X-ray of one material have shorter wavelength than Kα X-ray of another?


The figure shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes. The solid curve represents the relation for the tube A in which the potential difference between the target and the filament is VA and the atomic number of the target material is ZA. These quantities are VB and ZB for the other tube. Then,


50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be


The Kβ X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.


The Kα X-rays of aluminium (Z = 13) and zinc (Z = 30) have wavelengths 887 pm and 146 pm respectively. Use Moseley's  law √v = a(− b) to find the wavelengths of the Kα X-ray of iron (Z = 26).

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)


Gamma rays D C Visible light B A

The above table shows different parts of the electromagnetic spectrum.
(a)    Identify the parts of the spectrum marked as A, B, C and D.
(b)    Which of the radiations A or B has the higher frequency?
(c)    State two properties which are common to all parts of the electromagnetic spectrum.
(d)    Name one source of each of the radiation of electromagnetic spectrum.
(e)    Name one detector for each of the radiation.
(f)    Name one use of each of the radiation.


Name the part of the electromagnetic spectrum which is: 
Suitable for radar systems used in aircraft navigation.


Identify the part of the electromagnetic spectrum used in
(i) radar and
(ii) eye surgery. Write their frequency range.


Answer briefly.

What are radio waves?


Answer briefly.

Name the most harmful radiation entering the Earth's atmosphere from outer space.


If the Earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.


Which of the following is a tool used for separating the different color wavelengths from each other?


The ozone layer absorbs


Radio waves of constant amplitude can be generated with.


SONAR emits which of the following waves?


Electromagnetic waves of wavelengths λ1, λ2 and λ3 are used in a radar system, in water purifiers and in remote switches of TV, respectively.

  1. Identify the electromagnetic waves.
  2. Write one source for each of them.

Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong? 


Which one of the following electromagnetic radiation has the least wavelength?


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