हिंदी

Answer briefly. Can we produce a pure electric or magnetic wave in space? Why? - Physics

Advertisements
Advertisements

प्रश्न

Answer briefly.

Can we produce a pure electric or magnetic wave in space? Why?

टिप्पणी लिखिए
Advertisements

उत्तर

No.
In vacuum, an electric field cannot directly induce another electric field so a “pure” electric field wave cannot exist and same can be said for a “pure” magnetic wave.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 13: Electromagnetic Waves and Communication System - Exercises [पृष्ठ २४०]

APPEARS IN

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

वीडियो ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्न

Name the parts of the electromagnetic spectrum which is

used to treat muscular strain.

Write in brief, how these waves can be produced.


To which part of the electromagnetic spectrum does a wave of frequency 5 × 1019 Hz belong?


Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.


Why are infra-red waves often called heat waves? Explain.


State Moseley's law


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

(a) Ultraviolet


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

(a) Visible. 


Name the rays or waves  of highest frequency .


The wavelength of X-rays is 0.01 Å. Calculate its frequency. State the assumption made, if any.


Can X-rays be polarised?


If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength


For harder X-rays,
(a) the wavelength is higher
(b) the intensity is higher
(c) the frequency is higher
(d) the photon energy is higher.


Continuous X-rays are made to strike a tissue paper soaked with polluted water. The incoming X-rays excite the atoms of the sample by knocking out the electrons from the inner shells. Characteristic X-rays are analysed and the intensity is plotted against the wavelength. Assuming that only Kα intensities are detected, list the elements present in the sample from the plot. Use Moseley's equation v − (25 × 1014Hz)(Z − 1)2.

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


Write the range of the wavelength of the following electromagnetic radiations:
(a) Infrared rays
(b) Ultraviolet rays
(c) γ -rays

Write one use of each of the above.


Name the scientist who discovered radio waves


Give two properties of ultraviolet radiations which differ from the visible light.

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.
    1. Calculate the speed of the wave.
    2. Name the medium through which it is traveling.

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


Answer briefly.

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


Solve the numerical problem.

Calculate the wavelength in nm of an X-ray wave of frequency 2.0 × 1018 Hz.


Light of wavelength `3500A` is incident on two metals A and B whose work functions are 3.2 eV and 1.9 eV respectively. Which metal will emit photoelectrons?


The area to be covered for T.V telecast is doubled then the height of transmitting antenna (T.V tower) will have to be:-


The frequency of e. m waves which is best suited .to observed of radius 3 × 10–4 his of the order of


All components of the electromagnetic spectrum in a vacuum have the same ______


One requires 11eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in ______.


The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is ______.


Why does microwave oven heats up a food item containing water molecules most efficiently?


The magnetic field of a beam emerging from a filter facing a floodlight is given by B0 = 12 × 10–8 sin (1.20 × 107z – 3.60 × 1015t) T. What is the average intensity of the beam?


What happens to the intensity of light from a bulb if the distance from the bulb is doubled? As a laser beam travels across the length of a room, its intensity essentially remains constant. What geometrical characteristic of LASER beam is responsible for the constant intensity which is missing in the case of light from the bulb?


What is the wavelength range of electromagnetic radiation used in radio broadcast?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×