solve as much as you can please

Q1: A signal with period T=0.002 sec what is its frequency? Q2) A signal x(t)=5cos(250t+/2) what is the value of its phase in degree? Q3) A signal x(t)=10+5cos(250t) what is the value of its DC component? Q4) A SIGNAL WITH PHASE =45 degree what is the phase in radian Q5) what is the value in Db for iput power Pi=1000 and output power Po=10000 Q6) A transmission channel between two DTEs is made up of three section. The first introduces an attenuation of 15dB, the second an amplification of 20dB, and the third an attenuation of 10dB. determine the total overall attention of the channel in Db. Q7 What is the task of the modem ? Q8 What is intermodulation noise Q9) what is the cause of thermal noise Q10) what is cross talk \& what is the impulse noise? Q11) for the signal shown What is the bit rate and the baud rate ? Q12) What is the bandwidth efficiency? write the equation Q13) What is calculated the theoretical maximum bit rate (give the Shannon equation ) Q14) Assuming that a PSTN has a bandwidth of 3000Hz and a signal-to-noise ratio of 20dB, determine the maximum theoretical data rate that can be achieved. Q15) a system with number of signals M=32 how many bit each signal contains ? Q16) Arrange the following transmission media according to bandwedth from higher to lower. (UTP , single mode Fiber, STP, Coaxial , multi-mode fiber) Q17 ) What is the propagation mode of signal with frequency lower than 300KHz ( select ground wave, sky wave , line of sight) Q18) What is the propagation mode of signal with frequency higher than 1GHz ( select ground wave, sky wave, line of sight ) Q19) What is the propagation mode of infra red signal ( select ground wave, sky wave , line of sight) Q20) is the abbreviation (VHF) for wireless on wired transmission media