The range of sound frequencies that humans can typically hear is known as the audible range.
For humans, audible sound waves fall within a specific frequency spectrum. This range allows us to perceive sound.
The standard audible frequency range for healthy young humans is generally considered to be from $20\text{ Hz}$ (Hertz) to $20000\text{ Hz}$ ($20\text{ kHz}$).
Therefore, the audible waves for humans are those with the frequency range between $20\text{ Hz}$ to $20000\text{ Hz}$.
What is the colour of the light emitted by the Sun?
Lightning occur in the sky when two clouds:
With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
2. As street lights, sodium lamps have a longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
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Which one of the following is a reason why astronomical distances are measured in light-years?
In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid
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