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How does a switchman signal a railroad engineer at night?
With a lantern, or via radio.
Why we need high power to generate AM signal and low power to generate FM signal?
The reason FM has lower power and AM has higher power is because the more power that an AM signal has, the farther it will go, but FM does not work that way. AM waves can bounce off of the atmosphere, especially at night. This is the reason that you can hear AM stations from far away at night. FM, on the other hand, can't bounce. FM waves only go in a straight line from the tower and no matter how much power you transmit with, an FM wave will only go a short distance. AM Waves can travel through trees and buildings, and FM can't.
Why phosphor screen is used in night vision goggles?
In a night vision tube, the object of the tube is to convert incoming light particles (photons) to electrons. The electrons are then multiplied many times by the microchannel plate inside the tube. It is these multiplied electrons that are the output 'signal'. However, since your eye cannot see electrons, they are converted back to visible light by way of the phosphor screen which 'lights up' when energized by the electrons.
What are some advantages of night vision devices?
Because humans have poor night vision.
When did lawyer come?
they come about when to night was dark
Which visual distress signal is acceptable for night use only?
hand held red flare
What statements is true concerning visual distress signals?
Pyrotechnic visual distress devices have an expiration date.
What statements are true concerning visual distress signals?
flares are rated for day, night or combined day/night use
What is true concerning visual distress signals for boating?
Flares are rated for day, night or combined day/night use.
What is to be carried aboard a 25 foot powerboat when operating at night?
approved visual distress signals
What is required to be carried aboard a 25 foot powerboat operating at night?
approved visual distress signals
What is required to be carried aboard a 25 foot powerboat when operating at night?
approved visual distress signals
Is required to be carried aboard a 25 foot powerboat when operating at night?
approved visual distress signals
What is required to be carried aboard a 25-foot powerboat when operating at night?
approved visual distress signals
Which of the following is required to be carried aboard a 25 foot powerboat when operating at night?
Approved visual distress signals
Why didn't some other ship answer Titanic's distress signal?
there was no boats around, it was very late at night.
What visual distress signals is approved for use at night on a vessel red flare orange smoke?
Waving your hands not as a fist
