The Planck era refers to the time period
A) before the Big Bang.
B) before the Planck time.
C) after the Planck time.
D) after inflation.
E) after the GUT era.
B
You might also like to view...
Two solenoids are each made of 2000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
A. 1/4. B. 1/2. C. 1. D. 2 E. 4.
147.5 ml of ethyl alcohol (coefficient of volume expansion 
at a temperature of 273.1 K is measured into a 150.0 ml glass beaker (whose coefficient of volume expansion is negligible by comparison). To what temperature does the beaker have to be warmed for it to be completely full (i.e. for the volume of the alcohol to reach 150.0 ml)?
A. 288.0 K B. 278.1 K C. 283.1 K D. 288.2 K
Life on Earth remained single celled for ________ years, according to the microfossil record
Fill in the blank(s) with correct word
When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is
A) less than 1000 N. B) more than 1000 N. C) 1000 N. D) need more information