Atelevision relay transmitter operates at a frequency of 927.9 mhz. calculate the wavelength of the signal in nanometers. is this visible light? (1 mhz = 1,000,000 hz)

Answer : The wavelength of the signal is . This is not a visible light.

Solution : Given,

Frequency = 927.9 MHz =      

Speed of light =

Formula used :

where,

= frequency

= wavelength

c = speed of light

Now put all the given values in this formula, we get the wavelength of the signal.

This is not a visible light because the range of visible light is (380 to 700 nm).

Therefore, the wavelength of the signal is . This is not a visible light.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.