A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 × 10^-6 m, how many photons are in each pulse?
a. 2 × 10^25
b. 2 × 10^21
c. 3 × 10^18
d. 6 × 10^38
e. 2 × 10^18
E
Physics & Space Science
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a. True b. False Indicate whether the statement is true or false
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Observed temperature fluctuations in the Cosmic Microwave Background Radiation are:
A) millions of kelvins. B) hundreds of kelvins. C) a few kelvins. D) tens of millionths of a kelvin. E) immeasurably small.
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The intensity of a sound wave is proportional to its
A) wavelength. B) decibel level. C) power. D) Doppler shift.
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Today, global average temperatures are estimated using
A) orbiting satellites B) weather stations C) water temperature measurements by ships D) all of these
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