1 a)what is the wave length of a 100 MHz (fm 100) radio signal? b) imagine that

Question

1
a)what is the wave length of a 100 MHz (fm 100) radio signal?

b) imagine that you are observing a spacecraft moving in a circular orbit of a radius of 500000 km around a distant planet. you happen to be located in the palne of the spacecraft's orbit. you find that the spacecraft's radio signal varies periodically in a wavelength between 0.99976-1.00024m. assuming that the radio is broadcasting normally, at a constant wavelength, what is the mass of the planet?

c) the black body emission of spectrum of the object a peaks in the ultra violet region of the electromagnetic spectrum at a wavelenth of 150 nm. that of object b peaks in the red region at 630 nm. according to stefan's law how many times more energy per unit area does the hotter body radiate per sec. express in 2 significant figures? according to wein's law how many times hotter is it?

Explanation / Answer

a)v=f

   300000000=100000000

   =3m

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