568 muons were counted by a detector on the top of mount washington in a one hour period of time. assuming moving muons keep time at the same rate as stationary muons, then 27 should survive until sea level. the fact that 412 muons were detected by the same equipment at sea level reveals that
a. the stationary clock measures time differently at different altitudes
b. the moving clocks keep time at the same rate as stationary clocks
c. that moving clocks run slower
d. that moving clocks run faster

Explanation:

The fact that 412 muons were detected by the same equipment at sea level reveals that moving clocks run slower. This is due to the reason of time dilation.

The time dilation slow down time with respect to external observer. The time dilation is caused due to the force of gravity and the velocity with which the object is moving.

Hence, the correct option is (c) "moving clocks run slower".

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.