It is necessary to use satellites for long distance TV transmission. Why?

Q: Why do astronauts keep to altitudes beneath the Van Allen radiation belts when doing space walks?

A: The Van Allen Radiation belts are composed of electrically charged particles of protons and…

Q: What is the principal difference between a gamma ray and an infrared ray?

A: Given: gamma rays and infrared rays

Q: How long does it take, in minutes, for light to reach Mars from the Sun, a distance of 2.477×108 km?

A:

Q: Why are we able to use magnets to determine north-south directions on Earth?

A: To explain : why are we able to use magnets to determine north-south directions on earth ?

Q: Why do astronauts use radios while talking to one another in outer space?

A: Astronauts use radios while talking to one another in outer space.

Q: How does radio waves are produced

A: Introduction: The radio wave is a type of electromagnetic radiation which produce due to…

Q: why the diffraction are important for radio transmission

A:

Q: How is a radio wave transmitted?

A:

Q: Which  is the fastest communication channel?

A: A microwave is the fastest communication channel

Q: Do higher energy gamma rays travel faster, slower, or at the same speed in space than lower energy…

A: The higher energy gamma rays and lower energy radio waves , both are part of same electromagnetic…

Q: (121 – 0.327) - 119 13 2e - 5.4

A:

Q: 1. What can you observe from the picture below? Explain in detail. Penetrates Earth's Atmosphere?…

A: I have observed that, gamma rays have smallest wavelength and have higher temperatures and on the…

Q: Why is Infrared dangerous and how can we be protected?

A: Infrared radiations are very dangerous for us. Very high intensity of infrared radiations can cause…

Q: In the ionospheric propagation, consider the reflection takes place at a height of 400 km and that…

A: Given, Height (h)=400km Refractive index=0.9 Frequency=10Mhz

Q: At what frequencies does IRNSS satellites transmit their signals?

A: Answer - IRNSS satellites transmit their signal in S-band frequency ( 2-4GHz) and L5 band (1164 -…

Q: Give me a good introduction to a Spectrophotometer ??

A: Answer:-  Spectrophotometer is an instrument that measure the amount of light passing through a…

Q: Who discovered the radio waves?

A: Introduction: In the electromagnetic spectrum, several wavelengths of light are present.…

Q: What is the most suitable means of relaible continous communication between an orbital satellite and…

A: Microwave and radio waves are the most suitable means reliable continuous communication between an…

Q: Which travels faster through a vacuum - an infrared ray or a gamma ray?

A: Infrared and gamma rays are electromagnetic waves. So they travel at 3×108m/s in vacuum.

Q: Satellite radios operate at frequency of 2.3 GHz. Comment on possible reasons of choosing such…

A: Radio wave  are electromagnetic wave of frequency between 30Hz and 300GHz.They are generated by an…

Q: What is the wavelength of radio waves transmitted by a radio station with a frequency of 1360…

A:

Q: why the reflection are important for radio transmission.

A: here we will discuss about ;  reflection in radio transmission.

Q: Calculate the frequency of (a) 20-cm radio wave and (b) 10-10 m x-ray.

A: Given data: Wavelength of radio wave (λ) = 20 cm = 0.20 m Wavelength of x-ray (λ) = 10-10 m…

Q: What type of energy does a radio use?

A: Given:  radio

Q: Which among the following justifies aurora borealis’ connection to Earth acting as a gigantic…

A: We have to write aurora borealis’ connection to Earth acting as a gigantic magnet.

Q: Why do different radio stations have different radio frequencies assigned?

A: Solution: Radio stations work on different radio-wave bandwidths, which we will discuss in below to…

Q: One way to shield a habitat in outer space from cosmic rays is with an absorbing blanket of some…

A: The earth is protected from cosmic rays by atmosphere and the earth’s magnetic field. Thus, the…

Q: How the low frequency signal could be transmitted through long distances?

A: Frequency: It is the number of complete cycle in a second is known as frequency. The SI unit of…

Q: Why infrared radiations are used for signals during the war?

A: The primary source of infrared radiation is heat or thermal radiation. This is the radiation…

Q: True or false "Radio waves are a form of light"

A: Yes , Radio waves are a form of light waves.All waves present in the electromagnetic spectrum are a…

Q: Light does bend in a gravitational field. Why is this bending not taken into consideration by…

A: Light bends in gravitational field .But the gravitational field should be strong enough to notice…

Q: UNT has a radio station broadcasts at FM 88.1 MHz.  The radio wavelength is _____ meter

A: radio frequency is f = 88.1 MHz = 88.1 Mega Hertz = 88.1 x 106 Hertz = 88.1 x 106 Hz

Q: What is the most amount of time (in minutes) for a signal from the Mars Rover to reach Earth? (This…

A: GivenDistance between Mars and Earth (D) = 401 million km =401 ×106 km

Q: Why is micro wave and radio wave radiation dangerous for us?

A: Microwave radiation is capable of heating the body tissue in the same way it is capable of heating…

Q: Which part of the EM spectrum is used to transmit signals to and from satellites?

A: The part of EM spectrum that has maximum frequency are microwaves. Microwaves are produced by the…

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.