2. what checks should be carried out while at sea? assist in carrying out such checks.
2006-09-19 10:07:38 · 4 answers · asked by Via L 2 in Science & Mathematics ➔ Other - Science
The advantages of a high frequency (200kHz) are good detection, a narrow signal beam for sampling a smaller area of the seabed, resulting in better definition when looking for holes, reefs or small rocks on the seabed.
The downside of high frequency is penetration. No matter how powerful the echo sounder, a high frequency will not perform much beyond 180-200 metres. Low frequency, usually 50kHz, offers improved water penetration (range).
Safety at sea...
1. Keep a good look out at all times and be aware of your surroundings
2. Be sensible about drinking alcohol - it will impair your judgement
3. If you smoke be careful - a fire at sea can be disastrous
4. Always turn cooking gas bottles off at source when not in use
5. Keep an eye on the weather and sea conditions. Seek shelter in good time.
2006-09-22 08:51:51 · answer #1 · answered by Mowgli 6 · 0⤊ 0⤋
1. High frequency gives better resolution.
2. I can think of more than 2, but it seems to me that the most important are: a) Is my boat sinking?, and b) Am I headed into a Storm? Latitude, Longitude, GMT, and LMT might be good things to check, too.
3) How can I do that when I'm landlocked and have trouble following orders?
2006-09-19 10:31:36 · answer #2 · answered by Helmut 7 · 0⤊ 0⤋
The question is fallacious: Frequency, the inverse of wavelength, has no longer some thing to do with the quantity of power of a valid wave. A wave is defined in area by making use of three houses: Frequency, Amplitude, and section Shift. each is autonomous of one yet another. So, Amplitude must be some thing (huge or tiny) for any frequency. frequently although, larger frequency waves attenuate faster than low frequency waves (till in a vacuum), so all issues being equivalent once you've a suitable source, generating waves of all frequencies with the exact same amplitude and also you're measuring the amplitude of each frequency at faraway from the source, the measured amplitude of the decrease frequency waves will be larger than that of the severe frequency waves. it really is rationalization why you could in reality truly listen the bottom noise from autos which have their audio gadget cranked up loud at the same time as they are close by.
2016-11-28 02:31:41 · answer #3 · answered by ? 3 · 0⤊ 0⤋
it has better penertration therefor goes further
2006-09-19 10:16:38 · answer #4 · answered by happysurferuk 2 · 0⤊ 0⤋