Pregnancy lasts approximately 9 weeks (63 days) in the cat. However, it is not possible to detect pregnancy during the first 3 weeks. An experienced veterinarian may be able to palpate or feel the fetuses in the uterus of a relaxed cat, as the optimal time for pregnancy palpation is about 28-32 days of pregnancy.
Answers. Relevance. Rating Newest Oldest. The speed of electromagnetic waves in vacuum is the speed of light in vacuum because light is an electromagnetic wave: c = 299,792,458 meters per second, exactly (0.670617 billion mph).
In a vacuum, electromagnetic waves travel at the speed of light, which is a constant (2.9979 x 108 ms-1). The intensity/strength of the electric field and the magnetic field has a constant ratio, and they oscillate in phase. The electromagnetic waves have different wavelengths and frequencies.