Long distance radio broadcasts use short wave bands, why? - Vidyadip

Question

Long distance radio broadcasts use short wave bands, why?

✓

Answer

Radio broadcasts use the reflection of transmitted waves through different ionospheric layers. These layers reflect short wavelength bands.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Electromagnetic Waves→Electromagnetic Waves — all question types→Physics STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

In the decay $^{64}\ce{Cu \rightarrow ^{64}Ni + e^+ + v}, $ the maximum kinetic energy carried by the positron is found to be $0.650MeV.$

What is the energy of the neutrino which was emitted together with a positron of kinetic energy $0.150MeV$?
What is the momentum of this neutrino in $kg-m/s$ ?

Use the formula applicable to a photon.

What is meant by radioactive equilibrium?

If a constant potential difference is applied across a bulb, the current slightly decreases as time passes and then becomes constant. Explain.

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $22^\circ$ with the horizontal. The horizontal component of the earth’s magnetic field at the place is known to be $0.35 G.$ Determine the magnitude of the earth’s magnetic field at the place.

A different of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom make a transition from the upper level to the lower level?

What will be the effect on inductive reactance XL and capacitive reactance XC if frequency of ac source is increased?

In $1959$ Lyttleton and Bondi suggested that the expansion of the Universe could be explained if matter carried a net charge. Suppose that the Universe is made up of hydrogen atoms with a number density $N,$ which is maintained a constant. Let the charge on the proton be: $e_p = -(1 + y)e$ where e is the electronic charge.
Show that the velocity of expansion is proportional to the distance from the centre.

(a) Calculate the potential at a point $P$ located at a distance of 9 cm due to the charge $4 \times 10^{-7} C$.(b) Now, find the work done in bringing the charge $2 \times 10^{-9} C$ from infinity to point P . Does the answer depend on the path along which the charge is brought?

What is the work function of metal? It depends on which factors?

Assume that the magnetic field is uniform in a cubical region and is zero outside. Can you project a charged particle from outside into the field so that the particle describes a complete circle in the field?