English

Calculate the wavelength of a microwave of a frequency of 8.0 GHz.

Advertisements
Advertisements

Question

Calculate the wavelength of a microwave of a frequency of 8.0 GHz.

Numerical
Advertisements

Solution

Given: ν = 8 GHz = 8 × 109 Hz, c = 3 × 108 m/s

To find: Wavelength (λ)

Formula: c = νλ

Calculation: From formula,

λ = `"c"/ν`

= `(3xx10^8)/(8xx10^9)`

= 3.75 × 10−2

= 3.75 cm

The wavelength of microwave is 3.75 cm.

shaalaa.com
  Is there an error in this question or solution?
Chapter 13: Electromagnetic Waves and Communication System - Exercises [Page 241]

APPEARS IN

Balbharati Physics [English] Standard 11 Maharashtra State Board
Chapter 13 Electromagnetic Waves and Communication System
Exercises | Q 3. (iv) | Page 241

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

Why are microwaves considered suitable for radar systems used in aircraft navigation?


Give a reason for the following:

Long-distance radio broadcasts use short-wave bands. Why?


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


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


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?


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) Radio waves. 


State the approximate range of wavelength associated with the ultraviolet rays.


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


Visible light passing through a circular hole forms a diffraction disc of radius 0.1 mm on a screen. If an X-ray is passed through the same setup, the radius of the diffraction disc will be


X-ray incident on a material
(a) exerts a force on it
(b) transfers energy to it
(c) transfers momentum to it
(d) transfers impulse to it.


The electric current in an X-ray tube (from the target to the filament) operating at 40 kV is 10 mA. Assume that on an average, 1% of the total kinetic energy of the electron hitting hte target are converted into X-rays.
(a) What is the total power emitted as X-rays and (b) how much heat is produced in the target every second?


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.)


Arrange the following electromagnetic waves in increasing order of their frequencies (i.e. begin with the lowest frequency):
Visible light, y rays, X rays, microwaves, radio waves, infrared radiations, and ultraviolet radiation.


Name the radiation of the electromagnetic spectrum which is used for the following:

Radar and Give the frequency range.


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


Name two sources of infrared radiation.


Give one use of electromagnetic radiations in Infrared radiation.


Choose the correct option.

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


Answer briefly.

What are radio waves?


Solve the numerical problem.

Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in a vacuum is 3.0 × 108 m/s.


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.


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


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?


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? 


What happens when an electron collides with a positron?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×