Yellow waves

Use Figure 1.2 to find the wavelength and frequency of blue and yellow waves ... 

Compare the energy of blue and yellow waves to the sense of temperature evoked by these colors. Was your sense of temperature confirmed in Activity 1.5 ... 

Calculate the frequency of blue and yellow waves by dividing the speed of light (2.9979x10 m/sec) by each wavelength in meters, and compare these answers to the values given in Figure 1.2. 

From Activity 1.5, it can be seen that blue waves carry more energy than yellow waves (a blue flame is hotter than a yellow flame). Yet we often think of blue as being cool and yellow as being warm Blue jeans are cool the sun is warm. There is little relationship between the energy of visible waves and the psychological significance of their colors. 

Yellow waves have lower energy, longer wavelengths, and lower frequencies than blue waves. 

Yellow waves have less energy than blue waves. However, yellow, the color of the sun, is usually associated with warmth and blue, the color of the sky, is usually associated with cooler temperatures. 

The light induced spatial bifurcation of the yellow wave into a number of alternate red and yellow bands at low pH of the gel containing Hg + (pH 2.72) dependence of the precipitation pattern on the orientation of tubes and influence of electric field on the kinetics of yellow and red wave propagation. 

It was observed that the yellow wave propagated downward in the presence or absence of natural light at pH 4.68 of lower content. However, a remarkable change in its characteristics could be noticed when the pH was reduced by adding a small amount of acetic acid. At pH<2.72, the yellow wave bifurcates into many alternate red and yellow bands at the lower end of the tube in the presence of natural light. 

Experiments on the yellow wave propagation at different tube orientations were carried out by Das et al. [71]. Results revealed that the location of bands in the horizontal tube (H) was approximately half-way between those in the and directions. 

Influence of external electric field on the propagation of yellow wave has been studied in agar-agar gel at different field intensities employing the experimental setup... 

In the earlier communication, Das et al. [67] reported results of the investigation on the one-dimensional propagation of yellow/red mercuric iodide. In a later communication, Das et al. [68] reported new results on the two-dimensional propagation of a red/yellow wave of mercuric iodide, in gel media in batch, DPL and gel-ring reactors. Salient features of the investigation are as follows Precipitation was carried out in a DPL continuous flow reactor, as described earlier, in which the concentration and level of the entering reagent in the empty space were always kept constant. Experiments were... 

The kinetics of yellow wave propagation at different [KI] studied in the DPL reactor results showed that the velocity of propagation increased with increase in [KI],... 

The velocity of yellow wave propagation also depended on temperature. The velocity increased with temperature. 

After the dipped or sprayed chromatogram has been dried in a stream of cold air long-wave UV light (2 = 365 nm) reveals fluorescent yellow zones (flavonoids). Sterigmatocystine, which can be detected without derivatization on account of its red intrinsic fluorescence (detection limit 0.5 pg), also fluoresces pale yellow after being heated to 80°C [9] or 100°C [13] for 10 min on the other hand, citrinine, zearalenone and vomitoxin fluoresce blue. 

Detection and result The chromatogram was freed from mobile phase and dipped for 1 s in solution I and after drying for 1 min in a stream of cold air it was dipped in a solution of liquid paraffin — -hexane (1 + 2) in order to stabilize and increase the intensity of fluorescence by a factor of 1.5—2.5. The derivatives which were pale yellow in daylight after drying fluoresce pale blue to turquoise in long-wave... 

Primary and secondary amines and phenols generally produce yellow to reddish-orange zones (serotonin violet) on a pale yellow background, under long-wave-... 

Yellow-green fluorescent zones are formed on a dark background in long-wave-length UV light (2 = 365 nm). 

Repeated attempts to obtain the band at 1030 cm 1 in spectra of the respective solids of various compositions did not furnish the desired result. Nevertheless, the band was observed in IR transmission spectra of gaseous components that separated from molten K2NbF7 and were collected in a standard gas phase cell with Csl windows appropriate for IR measurements. Fig. 85 presents the structure of the band and exact wave numbers of its components. Storage of the gas in the cell for several days resulted in a yellow deposit on the windows due to oxidation and subsequent separation of iodine. Analysis of available reported data [364 - 367] enables to assign the band observed at -1030 cm 1 to vibrations of OF radicals. It should be emphasized that a single mode was observed for OF in the argon matrix while in the case of nitrogen, two modes were indicated [367]. 

Nevado, J.J.B., Square wave adsorptive voltammetric determination of sunset yellow, Talanta, 44, 467,1997. 

The members of Wolfbeis team constructed an optical sensor for ammonia-based on ion pairing76. They immobilized pH-sensitive dye (bromophenol blue) as an ion pair with cetyltrimethylammonium bromide (CTABr) in a silicone polymer matrix. Bromophenol blue, while contact the ammonia (both in water as well as in gaseous form) changes its color reversibly from yellow to blue. The immobilized dye shows long wave absorption with a good photostability. 

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