What is an X-ray burster? What causes the X-ray bursts?
What will be an ideal response?
It is a neutron star in a close binary system; hydrogen-rich material from the companion builds up on the surface and, eventually, helium fusion ignites in the layer beneath; this causes the X-ray burst.
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The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
in SI units. What is the speed of the EM wave?
A. 3 × 108 m/s B. 100 m/s C. 106 m/s D. 2 × 107 m/s E. 2 × 108 m/s
Two slits separated by 0.10 mm are illuminated with green light (? = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away
a. 2.3 b. 2.5 c. 2.7 d. 2.1 e. 2.0
In a double-slit interference experiment you are asked to use laser light of different wavelengths and determine the separation between adjacent maxima. You observe that this separation is greatest when you illuminate the double slit with
A) blue light. B) green light. C) yellow light. D) red light. E) The separation is the same for all wavelengths.
In a photo like the Hubble Deep Field (Figure 16.1 in your textbook), we see galaxies in many different stages of their lives. In general, which galaxies are seen in the earliest (youngest) stages of their lives?
A) the galaxies that have the most hot, young O and B stars B) the galaxies that are the reddest in color C) the galaxies that are farthest away D) the galaxies that are nearest to us