When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of interference
Indicate whether the statement is true or false
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An X-ray burster occurs in a pulsar when ____
a. accreted helium suddenly fuses in a nova-like explosion b. the Chandrasekhar limit is exceeded and the object collapses c. carbon deflagration destroys the object d. it merges with a binary companion e. hydrogen fusion ignites in an accretion disk around it
The results of statistical studies of the exoplanet systems discovered to date suggest that
A) planets are common B) small planets outnumber large plates by a significant margin C) Earth-size planets are very common D) all of these are true
The force due to gravity between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does G represent?
A) the distance between the two objects B) the universal gravitational constant C) the density of the smaller object
The force exerted on a current-carrying wire located in an external magnetic field is directly proportional to which of the following?
a. field strength c. both A and B b. current strength d. None of the above are valid.