Yes, on some types of video, a higher scanning rate will improve the picture.
It depends on what you want to do.
The higher the Hz on your TV, the more fluid the pictures will seem to your eye. In general, a higher refresh (Hz) rate is better, but you might not be able to tell much, or any difference depending on what you're watching.
Low hz
No, anything at 60hz or more is enough for any gaming console or PC
With picture, the higher the hertz (Hz), the better the quality will be. For this case, a 120H would be better than the 40H. With sound, it depends on the size of the speakers. Small satellite speakers would push out around 100-120Hz. But if you were to utilize mutliple woofers, it could be anywhere from 40-80Hz.
For a CRT, I find 75 hz much better, particularly when under florescent lighting. Since the lights run at 120 hz, the monitor can get into a 'synch' with the lights which creates moire patterns on the screen. Changing the rate to 75 or higher prevents this from happening and reduces eye strain. LCD screens (flat screens) are not likely to have this issue at all and it shouldn't matter.
600. Absolutely.
Higher notes have higher frequencies. A typical tuning fork vibrates at 440 Hertz. That's the tone of the A above middle-C on a piano. The A one octave higher is 880 Hz (2 x 440 Hz). The A one octave above that is 1760 Hz (2 x 880 Hz). The A below middle-C is 220 Hz (440 Hz ÷ 2), the next lower A is 110 Hz, and so on. The lowest note on a piano is 27½ Hz, and the highest is 4186 Hz.
560 Hz has a higher frequency than 7.83 Hz. "Stronger or weaker" cannot be determined from frequency alone.
It is if you watch sports.
Hz on a RAM is the speed of which the hardware can read. the higher the Hz the faster RAM.
50 hz is better .At this freq several losses in motors and power sys r reduced a lot when compared to 60 hz .also in 60hz sys the laminations must made thinner increasing initial cost.the advantage of 60 hz is ,we know that in present turbo alternator sys speed obtained is much higher than 3000rpm so this can utilised upto 3600rpm in caseof 60 hz sys
If you're starting from scratch, there's really no important difference between them, either will do. If you're building/buying something to work with existing equipment, then you'd have to figure out the frequency that'll work best together with that.