PHYSICAL LAYER AND TRANSMISSION MEDIA
INTRODUCTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
True
|
|
|
False
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -Amplitude, frequency and phase are all characteristics of a sound wave. Frequency modulation refers to the changing of the height of the sound wave. Baud rate is the number of bits transmitted per second. Signal bandwidth is the difference between the highest and lowest frequencies in a band.
Detailed explanation-2: -Sound is a longitudinal wave which consists of compressions and rarefactions travelling through a medium. Sound wave can be described by five characteristics: Wavelength, Amplitude, Time-Period, Frequency and Velocity or Speed. The minimum distance in which a sound wave repeats itself is called its wavelength.
Detailed explanation-3: -Frequency is the number of cycles a radio wave completes in one second. For example, wireless network signals typically operate at 2.4ghz or 5ghz. Amplitude is how strong those radio frequencies are. Finally, phase is the relation that multiple radio signals have that share the same space and frequency.
Detailed explanation-4: -a. TRUE-A sound wave transports its energy by means of particle interaction. A sound wave cannot travel through a vacuum. This makes sound a mechanical wave.