 508  84. Having extracted the acid, they continued experimenting. 85. There being an admixture in the parent compound, the overall yield proved to be low. 86. The data obtained are considered as not being adequately represented by equation 1. 87. The PCM signal is first changed to a frequency-shift form of modulation with frequencies of 3225 and 2775cps representing the binary 1 and 0, respectively. 88. Amber, glass and sealing-wax are among the substances to be easily electrified by rubbing. 89. Some advantage in detector sensitivity is to be gained by working at low outlet pressures. 90. There is definite justification for saying that a correlation does exist between helium content and colour. 91. The name electronics is known to be derived from the word electron, the electron itself being the basic unit of negative electricity and all electric currents consisting of electrons in motion. 92. Both filters employ ladder networks, with the tone filter using two crystals and the carrier filter three crystals. 93. Some scientists consider Mars to be covered with vegetation. 94. These practical considerations suggest that alternative schemes exploiting more traditional circuitry should be sought. 95. The atmosphere has been proved to extend several hundred kilometers above the earth. 96. A possible reason for increasing the estimated A might be supposed to be that the observed G is influenced by retardation effect and may therefore be too small. 97. Among all forms of magnetic storage, magnetic tapes were the first to be proposed in connection with digital computers. 508 |
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