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Answer briefly. What is a carrier wave? - Physics

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प्रश्न

Answer briefly.

What is a carrier wave?

एका वाक्यात उत्तर
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उत्तर

The high-frequency waves on which the signals to be transmitted are superimposed are called carrier waves.

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पाठ 13: Electromagnetic Waves and Communication System - Exercises [पृष्ठ २४१]

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बालभारती Physics [English] Standard 11 Maharashtra State Board
पाठ 13 Electromagnetic Waves and Communication System
Exercises | Q 2. (xiii) | पृष्ठ २४१

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

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


A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?


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


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


A wave has a wavelength of 10-3 nm. Name the wave.


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


Name the waves of wavelength nearly 0.1 nm.


An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm Calculate the velocity of the wave.


Can X-rays be polarised?


Characteristic X-rays may be used to identify the element from which they are being emitted. Can continuous X-rays be used for this purpose?


One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent 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.


The short-wavelength limit shifts by 26 pm when the operating voltage in an X-ray tube is increased to 1.5 times the original value. What was the original value of the operating voltage?

(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.)


A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 × 10−26 kg.

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


Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.


How will you investigate the existence of the radiation beyond the red and violet extremes of the spectrum?


State three properties of ultra-violet radiation similar to visible light.


Choose the correct option.

Earth’s atmosphere is richest in


Answer briefly.

Does an ordinary electric lamp emit EM waves?


Answer briefly.

Why light waves travel in a vacuum whereas sound waves cannot?


Solve the numerical problem.

The speed of light is 3 × 108 m/s. Calculate the frequency of red light of a wavelength of 6.5 × 10−7 m.


For television broadcasting, the frequency employed is normally


The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-


Ozone layer above the earth's atmosphere will


Given below in the left column are different modes of communication using the kinds of waves given in the right column. 

A.  Optical Fibre
Communication
P. Ultrasound
B. Radar Q. Infrared Light
C. Sonar R. Microwaves
D. Mobile Phones  S. Radio Waves

From the options given below, find the most appropriate match between entries in the left and the right column.


Below is an incomplete table showing the arrangement of electromagnetic spectrum in the increasing order of their wavelength. Complete the table:

Gamma ray X - ray UV rays Visible rays Infrared A Radio waves
  1. Identify the radiation A.
  2. Name the radiation used to detect fracture in bones.
  3. Name one property common to both A and Radio waves.

What happens when an electron collides with a positron?


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