Two sources emit beams of light of wavelength 550 nm. The light from source A has an intensity of 10 µW/m2, and the light from source B has an intensity of 20 µW/m2. This is all we know about the two beams
Which of the following statements about these beams are correct? (There could be more than one correct choice.) A) Beam B carries twice as many photons per second as beam A.
B) A photon in beam B has twice the energy of a photon in beam A.
C) The frequency of the light in beam B is twice as great as the frequency of the light in beam A.
D) A photon in beam B has the same energy as a photon in beam A.
E) None of the above statements are true.
A
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Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined ramp and allowed to slide down from rest without any air resistance. Which one of the following statements about these objects is correct?
A) It takes the lighter object 5 times longer to reach the bottom of the ramp than the heavier. B) It takes the lighter object 10 times longer to reach the bottom of the ramp than the heavier. C) It takes the heavier object 5 times longer to reach the bottom of the ramp than the lighter. D) It takes the heavier object 10 times longer to reach the bottom of the ramp than the lighter. E) The two objects reach the bottom of the ramp at exactly the same time.
Which of the following explains why we do not consider the surface of Mars to be habitable today?
A) Mars has too much carbon dioxide in its atmosphere. B) Mars is located far outside the Sun's habitable zone. C) The atmospheric pressure is too low for liquid water to be stable on the surface. D) Mars is bombarded too often with asteroids and comets. E) Mars has too little gravity for its surface to be habitable.
Hubble's law can be applied to measure the distance of the constellation of Orion.
Answer the following statement true (T) or false (F)
You are in a place that is extremely hot and dense, making you feel quite sweaty and claustrophobic. You can't see far because your surroundings are opaque to light. Around you, nuclear fusion is converting carbon into oxygen and other elements
Where are you? A) You are in the center of a star very much like our Sun. B) You are in the early universe during the era of nucleosynthesis. C) You are inside a nuclear power plant on Earth. D) You are in the center of a massive star near the end of its life. E) You are in the center of a star much smaller than the Sun.