NCERT SOLUTION FOR CLASS 11th PHYSICS
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Thursday, 22 August 2013
NCERT Solutions For Class 11 Chemistry
Tuesday, 20 August 2013
NCERT Solutions for Class 12th Physics Chapter 11 - Dual Nature Of Radiation And Matter
NCERT Solutions for Class 12th Physics Chapter 11 - Dual Nature Of Radiation And Matter
Find the
(a) maximum frequency, and
(b) minimum wavelength of X-rays produced by 30 kV electrons.
NCERT Solutions for Class 12th Physics Chapter 10 - Wave Optics
NCERT Solutions for Class 12th Physics Chapter 10 - Wave Optics
Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected, and (b) refracted light?
Refractive index of water is 1.33.
Saturday, 10 August 2013
NCERT Solutions for Class 12th Physics Chapter 2 - Electrostatic Potential And Capacitance
Class 12th Physics Chapter 2 - Electrostatic Potential And Capacitance Solutions
NCERT Solutions for Class 12th Physics Chapter 15 - Communication Systems
NCERT Solutions for Class 12th Physics Chapter 15 - Communication Systems
Which of the following frequencies will be suitable for beyond-the-horizon communication
using sky waves?
(a) 10 kHz
(b) 10 MHz
(c) 1 GHz
(d) 1000 GHz
Answer
(b) Answer:
10 MHz
For beyond-the-horizon communication, it is necessary for the signal waves to travel a large distance. 10 KHz signals cannot be radiated efficiently because of the antenna size.
The high energy signal waves (1GHz − 1000 GHz) penetrate the ionosphere. 10 MHz frequencies get reflected easily from the ionosphere. Hence, signal waves of such frequencies are suitable for beyond-the-horizon communication.
Question 15.2:
Frequencies in the UHF range normally propagate by means of:
(a) Ground waves.
(b) Sky waves.
(c) Surface waves.
(d) Space waves.
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