Login or Register for FREE!
Login or Register for FREE!
Subel. 7
11 questions
Basic
Subelement 7

Radio Wave Propagation

Section 7-05

solar activity, sunspots, sunspot cycle

How do sunspots change the ionization of the atmosphere?

  • Correct Answer
    The more sunspots there are, the greater the ionization
  • The more sunspots there are, the less the ionization
  • Unless there are sunspots, the ionization is zero
  • They have no effect
This question does not yet have an explanation! Register to add one

Tags: none

How long is an average sunspot cycle?

  • 17 years
  • 5 years
  • Correct Answer
    11 years
  • 7 years
This question does not yet have an explanation! Register to add one

Tags: none

What is solar flux?

  • A measure of the tilt of the earth's ionosphere on the side toward the sun
  • The number of sunspots on the side of the sun facing the earth
  • Correct Answer
    The radio energy emitted by the sun
  • The density of the sun's magnetic field
This question does not yet have an explanation! Register to add one

Tags: none

What is the solar-flux index?

  • Another name for the American sunspot number
  • A measure of solar activity that compares daily readings with results from the last six months
  • Correct Answer
    A measure of solar activity that is taken at a specific frequency
  • A measure of solar activity that is taken annually
This question does not yet have an explanation! Register to add one

Tags: none

What influences all radiocommunication beyond ground-wave or line-of-sight ranges?

  • The F2 region of the ionosphere
  • The F1 region of the ionosphere
  • Correct Answer
    Solar activity
  • Lunar tidal effects
This question does not yet have an explanation! Register to add one

Tags: none

Which two types of radiation from the sun influence propagation?

  • Subaudible and audio-frequency emissions
  • Polar region and equatorial emissions
  • Infra-red and gamma-ray emissions
  • Correct Answer
    Electromagnetic and particle emissions
This question does not yet have an explanation! Register to add one

Tags: none

When sunspot numbers are high, how is the ionosphere affected?

  • Correct Answer
    Frequencies up to 40 MHz or higher are normally usable for long-distance communication
  • High frequency radio signals are absorbed
  • Frequencies up to 100 MHz or higher are normally usable for long-distance communication
  • High frequency radio signals become weak and distorted
This question does not yet have an explanation! Register to add one

Tags: none

All communication frequencies throughout the spectrum are affected in varying degrees by the:

  • ionosphere
  • aurora borealis
  • atmospheric conditions
  • Correct Answer
    sun
This question does not yet have an explanation! Register to add one

Tags: none

Average duration of a solar cycle is:

  • Correct Answer
    11 years
  • 3 years
  • 6 years
  • 1 year
This question does not yet have an explanation! Register to add one

Tags: none

The ability of the ionosphere to reflect high frequency radio signals depends on:

  • Correct Answer
    the amount of solar radiation
  • the power of the transmitted signal
  • the receiver sensitivity
  • upper atmosphere weather conditions
This question does not yet have an explanation! Register to add one

Tags: none

Propagation cycles have a period of approximately 11:

  • Correct Answer
    years
  • months
  • days
  • centuries
This question does not yet have an explanation! Register to add one

Tags: none

Go to 7-04 Go to 7-06
HamStudy.org™ is copyright 2024 Signal Stuff™, All rights reserved.
View Privacy Policy    |    Get help with HamStudy.org™