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

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प्रश्न

Answer briefly.

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

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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.

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

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

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संबंधित प्रश्‍न

The small ozone layer on top of the stratosphere is crucial for human survival. Why?


State an additional use of the X-rays waves


What do you understand by the statement, "Electromagnetic waves transport momentum"?


The wavelengths for the light of red and blue colours are roughly 7.8 × `10^7` m and 4.8 × `10^7` m respectively.
(a) Which colour has the greater speed in vacuum?
(b) Which colour has the greater speed in glass?


Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.


Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.

  1. Name the two waves.
  2. Compare the speeds of these waves when they travel in vacuum.

Which part of electromagnetic spectrum is used in radar systems?


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


An X-ray beam can be deflected


The energy of a photon of a characteristic X-ray from a Coolidge tube comes from


50% of the X-rays coming from a Coolidge tube are able to pass through a 0.1 mm thick aluminium foil. If the potential difference between the target and the filament is increased, the fraction of the X-rays passing through the same foil will be


Cutoff wavelength of X-rays coming from a Coolidge tube depends on the
(a) target material
(b) accelerating voltage
(c) separation between the target and the filament
(d) temperature of the filament.


The wavelength of Kα X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell of a tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having tungsten target which allows production of Kα X-ray?

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


An X-ray tube operates at 40 kV. Suppose the electron converts 70% of its energy into a photon at each collision. Find the lowest there wavelengths emitted from the tube. Neglect the energy imparted to the atom with which the electron collides.

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


Suppose a monochromatic X-ray beam of wavelength 100 pm is sent through a Young's double slit and the interference pattern is observed on a photographic plate placed 40 cm away from the slit. What should be the separation between the slits so that the successive maxima on the screen are separated by a distance of 0.1 mm?


State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of the visible spectrum.


Give one use of electromagnetic radiations in Infrared radiation.


Choose the correct option.

Earth’s atmosphere is richest in


Choose the correct option.

How does the frequency of a beam of ultraviolet light change when it travels from air into glass?


Answer briefly.

Why are microwaves used in radar?


Answer briefly.

Why high-frequency carrier waves are used for the transmission of audio signals?


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


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?


Radio waves of constant amplitude can be generated with.


SONAR emits which of the following waves?


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


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?


Identify the electromagnetic wave whose wavelength range is from about 10-12 m to about 10-8 m. Write one use of this.


Choose the correct option related to wavelengths (λ) of different parts of the electromagnetic spectrum.


Name one radiation having the wavelength longer than the wavelength of these radiations.


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