A spaceship approaches the earth with a speed 0.50c. A passenger in the spaceship measures his heartbeat as 70 beats per minute. What is his heartbeat rate according to an observer that is at rest relative to the earth

61 bpm

Explanation:

By applying the relativistic Doppler Effect;

where;

frequency (f) = the heartbeat rate according to an observer that is at rest relative to the earth

= initial frequency of the heart beat = 70 beats per minutes (70 bpm)

v = speed of the spacecraft = 0.50 c

c = speed of the light

Replacing our values in the above equation; we have:

f = 60.62 bpm

f ≅ 61 bpm

interphase   is the cell cycle stage in which the cell acquires nutrients, creates and uses proteins and other molecules and starts the process of cell division by replicating the dna. it is the longest stage in the eukaryote cell cycle.

the following   can go wrong during interphase:   a base pair could be mismatched during the duplication process causing a mutation.   correct answer: c

explanation: