Passage III
Solar cycles are periodic variations in the Sun’s brightness.
Table 1 contains the date of onset for, and duration of, recent solar cycles; the time from a cycle’s onset until the Sun reached solar maximum (the maximum brightness for that cycle); and the number of sunspots at solar maximum.
Figure 1 shows the number of sunspots and the Sun’s brightness at a particular wavelength for part of one cycle.
For the same cycle, Figure 2 shows the number of proton events, when the Sun emitted much higher than average numbers of protons (positively charged particles).
14. The most likely reason that the data in Table 1 for Cycle 11 are incomplete is that:
Your Answer is
Correct Answer is J
Explanation
It can be seen from table 1 that a solar cycle is about 10-11.8 years. Cycle 11 started in September 1986 and should not end until 1996-1998;
Refer to figure 1 and figure 2, the data is only collected in 1994, which means that when this article is written, it has not yet reached 1996-1998, and Cycle 11 has not yet ended