relative frequency

Phon - Another Unit of Loudness - As the threshold of audibility varies with frequency, sounds of the same intensity but different frequencies are found to differ in loudness. Therefore, another unit of loudness is defined. This unit measures the intensity of a sound relati..

It is the modern theory on organic evolution. It is a synthesis of the ideas from the theory of natural selection and the mutation theory. The theory is the outcome of the thinking of recent biologists such as Huxley, Haldane and Dobzhansky. Neo-darwinism is based on three principles namely; genot..

Basic Terms Connected to Waves - The four important terms used in the study of waves are Wavelength, Amplitude, Frequency and Wave velocity. Wavelength ' l ' is the distance between two consecutive points on the wave which are in the same phase. (same phase means same state of vibrations)..

. The prongs are again drawn inwards. This process repeats and the prongs vibrate. The frequency of vibration is a constant, depending on the parameters related to the fork. A long flexible thread is attached to the end of a prong and the thread is passed over a frictionless pul..

The frequency ( n ) of emitted light is related to the energy difference of two levels ( D E) as E = 214.68 kJ mol - 1 , h = 39.79 x 10 - 1 4 kJ mol - 1 = 5.39 x 10 1 4 s - 1 8. The wavelength of first spectral line in the Balmer series is 6561 units. Calculate..

. Initially, the path lengths are adjusted to be equal. The outer tube is pulled out till the sound intensity becomes minimum. The distance through which the tube has been slided will be l /4, since the path difference is l /2. By measuring this distance using a scale, l can be calculated. Assuming..

They do not require any medium for propagation; in other words, these waves can pass through vacuum They require medium for propagation i.e. these waves cannot pass through vacuum All electromagnetic waves travel with the same velocity Matter waves travel with different velocities ..

De-Broglie Relationship - De-Broglie noted that according to the theory of relativity, the role played by momentum 'P' and the energy 'E' of the particle is done by angular frequency ' w ' and the propagation vector 'k' of a wave. According to Einstein relation E = mc ..

Doppler Effect in Light - Whenever there is a relative motion between a source of light and the observer, the apparent frequency of light received by the observer is different from the true frequency of light emitted actually from the source of light. If a source of li..

Thus the energy associated with a quantum of radiation depends inversely on its wavelength (or conversely with its frequency) i.e., higher the wavelength of radiation, lesser the energy associated with its quantum. For example a photon of violet light will have more energy than that of a ..