Q1.
all radio waves travel at 300 000 000 m/s in air
(1)
give the equation that links the frequency, speed and wavelength of a wave.
calculate the wavelength, in metres, of a radio wave which is broadcast at a frequency
of 909 khz,
wavelength =

Is a logical series of steps

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf