Let x be the number of photons counted by a receiver in an optical communication system. it is known that x is a poisson random variable with rate λ1 when a signal is present and a poisson random variable with rate λ0 < λ1 when a signal is absent. the probability that the signal is present is p. suppose that we observe x = k photons. we want to determine a threshold t such that if k ≥ t then we claim that the signal is present; and if k < t then we claim that the signal is absent. what is this t?

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answer;

the correct answer

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54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.