Why do the optical signals used in optical fibre cables have a
very short wavelength?​

What type of file does a cookie place on web site visitors' computers so that web site managers can customize their sites to their visitors' preferences?

Amedian in the road will be marked with a white sign that has a black arrow going to the left of the median. true false

Acomputer has a two-level cache. suppose that 60% of the memory references hit on the first level cache, 35% hit on the second level, and 5% miss. the access times are 5 nsec, 15 nsec, and 60 nsec, respectively, where the times for the level 2 cache and memory start counting at the moment it is known that they are needed (e.g., a level 2 cache access does not even start until the level 1 cache miss occurs). what is the average access time?