Author Question: A star is moving toward Earth at 90 the speed of light. The star emits light, which moves away from ... (Read 140 times)

tfester · **on:** Jul 29, 2018

A star is moving toward Earth at 90 the speed of light. The star emits light, which moves away from the star at the speed of light. What do Earth-based astronomers measure for the speed of this light?

A) c
B) 1.9c
C) 1.2c
D) 0.98c
E) 0.95c

Question 2

In the vicinity of what frequency does an object with a temperature of 1000 K radiate the largest amount of power? (c = 3.00 108 m/s,

Wien displacement law constant equals 2.90 10-3 m K,
= 5.670 10-8 W/m2 K4)
A) 1.0 1014 Hz
B) 8.0 1014 Hz
C) 2.3 1014 Hz
D) 6.7 1014 Hz
E) 4.1 1014 Hz