Un estudiante toma 200 mL de una disolución acuosa de HCl 2.0 M y le agrega agua
destilada hasta tener 500.0 mL de disolución. Calcular la nueva concentración molar.
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Ответ:
f = c/w
c = 2.998 * 10**8 meters per second.
f = (2.998 * 10**8) / (7.0 * 10**-7) = 4.283 * 10**14 cycles per sec.
Since the threshold frequency of Cs is 9.39 * 10**14 Hz, the red light doesn't
have a high enough frequency (or energy) to cause electron emission.