Author Question: A 100 W lightbulb has an energy efficiency of 5. It is turned on for one minute. During this time, ... (Read 61 times)

maegan_martin · **on:** Jul 29, 2018

A 100 W lightbulb has an energy efficiency of 5. It is turned on for one minute. During this time, the visible radiant energy output of the lightbulb is

A) 300 J.
B) 6000 J.
C) 5700 J.
D) impossible to determine because we don't know the voltage.
E) impossible to determine because we don't know the power.

Question 2

A 25-g string is stretched with a tension of 43 N between two fixed points 12 m apart. What is the frequency of the second harmonic?

A) 18 Hz B) 24 Hz C) 36 Hz D) 12 Hz E) 6.0 Hz