The discoverer of X-rays was
A)
Bragg.
B)
von Laue.
C)
Fermi.
D)
Roentgen.
E)
Xavier.
D
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Each atom of the same element, zinc for example, has the same number of
A) electrons in the nucleus B) electrons in the valence bond level C) neutrons in the outer nuclear shell D) protons in the nucleus
The light blue ellipse represents tidal bulges. In what way are these bulges drawn inaccurately?
A) There should be only one bulge rather than two. B) They should be aligned with the Sun rather than the Moon. C) They should be much smaller compared to Earth. D) They should be more pointy in shape.
What is the approximate diameter of the disk of the Milky Way?
A) 100 light-years B) 1000 light-years C) 10,000 light-years D) 100,000 light-years E) 1,000,000 light-years
Which doesn't belong to the same family?
A) infrasonic waves B) ultrasonic waves C) radio waves D) shock waves E) longitudinal waves