What is the unit of loudness phon?

The loudness level, in phons, of the measured sound is then equal to the sound-pressure level, in decibels, of the adjusted reference sound above the standard reference level, which is the minimum audible threshold.

What volume is 40 decibels?

20 dB: Whispering from five feet away. 30 dB: Whispering nearby. 40 dB: Quiet library sounds. 50 dB: Refrigerator.

How loud is 60 phon?

By definition, 1 phon is equivalent to 1 deciBel at 1000 Hz (1 kHz). Figure 1 shows several equal loudness curves. The curves were determined experimentally. Volunteers were subjected to a 1 kHz sound at 60 dB; this is a loudness of 60 phon.

What is the loudness of a 1000 Hz 40 dB tone?

The loudness in phons is the level in dB SPL of an equally loud 1000 Hz tone. So all tones judged equal in loudness to a 40 dB SPL, 1000 Hz tone have a loudness of 40 phons.

What is unit of loudness Class 8?

Decibel (Db)
Correct answer: Decibel (Db) Explanation for correct answer: A special scale called the decibel scale which measures the loudness of sound .

What is the unit of loudness Brainly?

The unit of loudness is decibel.

What is loudness scale?

Decibel Scale Sound is measured in units called decibels (dB). The higher the decibel level, the louder the noise. On the decibel scale, the level increase of 10 means that a sound is actually 10 times more intense, or powerful.

Which is louder 50 Hz or 1000 Hz?

The 1,000 Hz tone will seem far louder than the 50 Hz tone for most people, even though the sound levels are identical. Humans have far better hearing near 1000 Hz than at low frequencies like 50 Hz.

How many dB is 1000hz?

60 dB
Using the 1000 Hz sound as a standard, for example, if you look at the 40 phon line*2, the sound pressure of 1000 Hz is 40 dB, but you can tell it’s 60 dB for 125 Hz, and 73 dB for 63 Hz.