Yes, on some types of video, a higher scanning rate will improve the picture.
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.
It depends on the context. For display screens and gaming, higher Hz (refresh rate) is better for smoother motion. For audio, lower Hz (bass frequencies) are important for richer sound.
No, anything at 60hz or more is enough for any gaming console or PC
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.
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.
600. Absolutely.
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.
The greater the number the higher the frequency. Zero frequency is called DC in electricity. Audio frequencies start at 20 Hz (Hertz= cycles per second) and go up to 20,000 Hz. Adults usually can't hear above 12,000 Hz so this is why the teenagers use a ring tone of 13,000 Hz while in school. The teachers can't hear it. Refer to kHz which is 1,000 Hz. There for 20 kHz is 20,000 Hz.
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.
The frequency of A one octave higher is double the original frequency. For example, if the original A is 440 Hz, the A one octave higher would be 880 Hz.
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.