In a diffraction experiment, light of 600. nm wavelength produces a first-order maximum 0.350 mm from the central maximum on a distant screen. A second monochromatic source produces a third-order maximum 0
870 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?
497. nm
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Enrico Fermi was
A) the head of the program to develop the world's first fission bomb. B) the head of the program to develop the world's first fusion bomb. C) the inventor of radiation therapy. D) the discoverer of nuclear fission. E) the head of the program to develop the world's first nuclear reactor.
The Earth is 1.49 × 10^11 m from the Sun. If the solar radiation at the top of the Earth's atmosphere is 1 340 W/m2, what is the total power output of the Sun?
a. 7.48 × 10^27 W b. 2.34 × 10^30 W c. 6.62 × 10^26 W d. 3.74 × 10^26 W
The Hubble Space Telescope has been repaired
a. True b. False Indicate whether the statement is true or false
What makes us think that Mars must once have had an atmosphere that was warmer and had higher surface pressure?
A) The atmosphere is too cold and thin for liquid water today, yet we see evidence of flowing water in the past. B) We think it for purely theoretical reasons, based on calculations showing that the Sun has brightened with time. C) The presence of inactive volcanoes on Mars tells us that there must once have been a lot of outgassing, and hence a thicker atmosphere. D) The fact that parts of Mars have a lot of craters tell us that Mars must once have been much warmer.