The energy of a photon is proportional to the light's
a. wavelength.
b. speed.
c. frequency.
d. intensity.
e. two of the above.
E
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A gun is made of a super-low-weight but strong material. The bullet for the gun is more massive than the gun itself. For such a gun
A. the gun, if unsupported, would have a recoil velocity higher than the bullet velocity. B. the bullet would go faster with less powder. C. recoil problems would be lessened. D. conservation of momentum is not satisfied.
Suppose the star Betelgeuse (the upper left shoulder of Orion) were to become a supernova tomorrow (as seen here on Earth). What would it look like to the naked eye?
A) We'd see a cloud of gas expanding away from the position where Betelgeuse used to be. Over a period of a few weeks, this cloud would fill our entire sky. B) Because the supernova event destroys the star, Betelgeuse would suddenly disappear from view. C) Betelgeuse would remain a dot of light but would suddenly become so bright that, for a few weeks, we'd be able to see this dot in the daytime. D) Betelgeuse would suddenly appear to grow larger in size, soon reaching the size of the full moon. It would also be about as bright as the full moon.
Unlike Mercury, Saturn:
A) is a low-density planet. B) formed along with the Sun. C) formed along with Earth. D) is a Terrestrial planet.
A circular window of 30.0 cm diameter in a submarine can withstand a maximum force of 1.88 × 106 N. What is the maximum depth to which the submarine can go without damaging the window?
A) 750 m B) 2.70 km C) 945 m D) 1.33 km E) 1.20 km