Physics Answers

Radiation intensity of a dipole depends strongly on frequency. If at a frequency f, the intensity of radiation is 'I'. Then at a frequency of f/2, the intensity will be

The velocity of electromagnetic wave in a good conductor is

A.3 x 10⁸ m/sB.more than 3 x 10⁸ m/sC.very lowD.high

For F₁ layer the maximum ionic density is 2.3 x 10⁴ electrons per cc. The critical frequency for this layer will be

A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls Calculate group velocity for dominant mode.

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A rectangular metal waveguide filled with a dielectric of relative permittivity εr = 4, has the inside dimensions 3 x 1.2 cm, the cut off frequency for the dominant mode is

Charge needed within a unit sphere centуred at the origin for producing a potential field V=-6r^5/E0 where r less than or equal to 1

Find the radiation resistance of an antenna of length λ/10 meter?

A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.

How is the energy of a photon dependent on the frequency and wavelength? Based on that, how many photons are emitted in a nitrogen gas laser pulse with a wavelength of 337 nm and energy of 3.83 mJ?

If Rebecca is traveling at 7 m/s east for 1 hour how much is Rebecca displaced?