A schematic of a simple laser is shown here. Which of the following are characteristics of light produced by a laser?
a. Very narrow range of wavelengths.
b. Highly directional beam.
c. Very intense beam.
d. Light that is coherent.
e. All of the above.
e
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An unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.
Match the words at the left to the correct blanks in the sentences at right. You may use words more than once.
Explain the difference between apparent visual brightness and absolute visual brightness
What will be an ideal response?
When an 6-kg object increases its potential energy by 540 J, approximately how has its position changed?
a. It has risen vertically 9 m. b. It has fallen vertically 9 m. c. It has risen vertically 90 m. d. It has moved horizontally 90 m.