What makes one sound louder than another?
Changing the amplitude of a sound wave changes its loudness or intensity. A string plucked with force has greater amplitude, and greater amplitude makes the sound louder when it reaches your ear. Volume depends on amplitude. Greater amplitude produces louder sounds.
How does frequency affect sound?
Sound moves through a medium such as air or water as waves. It is measured in terms of frequency and amplitude. Frequency, sometimes referred to as pitch, is the number of times per second that a sound pressure wave repeats itself. High frequencies produce more oscillations.
Why do higher pitched sound louder?
A greater frequency than this will produce a higher-pitched note and so on. Children will often mix up pitch and loudness believing that a higher pitched sound is a louder one. Higher pitched sounds produce waves which are closer together than for lower pitched sounds.
What happens to loudness when frequency increases?
Increased frequency means decreased wavelength and higher pitch/ sharpness. So increase in frequency makes sound more sharper while higher amplitude or higher intensity makes louder sound.
At what level of intensity does sound become dangerous?
Sound is measured in decibels (dB). A whisper is about 30 dB, normal conversation is about 60 dB, and a motorcycle engine running is about 95 dB. Noise above 70 dB over a prolonged period of time may start to damage your hearing. Loud noise above 120 dB can cause immediate harm to your ears.
Does loudness depend on intensity?
The intensity of sound waves determines the loudness of sounds, but what determines intensity? Intensity results from two factors: the amplitude of the sound waves and how far they have traveled from the source of the sound. Greater amplitude waves have more energy and greater intensity, so they sound louder.
Is intensity directly proportional to frequency?
If intensity of a wave is proportional to frequency, why doesn’t sound level, in general, depend on frequency. i.e. Higher frequency, higher intensity, higher sound level. The loudness of a sound does not seem to depend on frequency. But according to the equation above, intensity DOES depend on frequency.
Is there any relation between frequency and intensity?
if you consider light is wave, intensity is related to light radiation energy and frequency is the number of waves per second. Frequency is related to photon’s energy (E = hν , E is energy, h is planck’s constant and ν is frequency) . In particle nature, intensity is related to number of photons in the radiation.
Does increasing frequency increase intensity?
Assuming the photon energy is sufficient to produce electron emission, increasing the intensity while keeping frequency fixed increases the number of photons hitting the metal, increasing the rate at which electrons are emitted but not changing the maximum kinetic energy of the electrons.
What happens to intensity if frequency is doubled?
2 Answers. Yes, the intensity depends, in part, on the frequency. If the only thing one changes is the frequency of the photons, then doubling the frequency will double the intensity. Alternately, doubling only the emission rate, or focusing the photons to hit half the area will also double the intensity.
Does photocurrent depend on frequency?
A. Depends both on intensity and frequency of the incident light. Does not depend on the frequency of incident light but depends on the intensity of the incident light. …
What is the effect of frequency on photocurrent?
Exactly. Higher-frequency photons have more energy, so they should make the electrons come flying out faster; thus, switching to light with the same intensity but a higher frequency should increase the maximum kinetic energy of the emitted electrons.
Does current increase with frequency?
In an inductive circuit, when frequency increases, the circuit current decreases and vice versa.
Why do only certain frequencies of light create photoelectrons?
The energy of photons of light is quantized according to the E = hv equation. The photoelectric effect is a phenomenon that occurs when light shined onto a metal surface causes the ejection of electrons from that metal. It was observed that only certain frequencies of light are able to cause the ejection of electrons.
Why can’t all light cause electrons to leave the surface?
Light carries ‘energy’, which is to say it can cause electrons to move about and a surface to heat up. Increasing the intensity of the light increases the number of ejected electrons per second, but their ejection speed (kinetic energy) remains the same. Light below a certain frequency ejects no electrons at all.
Why is there a threshold frequency?
Threshold frequency and work function This means it is easier to remove electrons from some metals than others. In turn, this means that the minimum frequency of photon needed to remove an electron from one metal can be lower than for another metal.
What is the threshold frequency of cesium?
The threshold frequency of Cs is 9.42×1014 Hz.
Is threshold frequency same for all metals?
Different metals have different values of work function because of difference in their electronegativity. Work function is that amount of energy required to get an electron out of the metal plate without any kinetic energy. The frequency of the photon with energy equal to work function is called threshold frequency.
What does threshold frequency depend on?
Threshold frequency does not depend on the intensity of light. Intensity of light affects the photoelectric current. Whereas frequency increases the Kinetic Energy of the photoelectron. Value of frequency of incident light for which the Stopping Potential is zero is called the Threshold Frequency.
Does work function depend on frequency?
Depends upon the frequency of incident light. Hint: The different metals consist of different values of work function because of difference in their electronegativity behaviour. Therefore the work function is that amount of energy which is required to get an electron out of the metal plate without any kinetic energy.