A photon is a boson
a. True
b. False
Indicate whether the statement is true or false
True
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A person's face is 30 cm in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?
A) 20 cm B) 30 cm C) 50 cm D) 70 cm E) 90 cm
The distance between two successive ‘like' points on a wave is the wave's __________
Fill in the blank(s) with correct word
How would you explain the average density of an asteroid being about 2 g/cm3, if the density of rock is usually around 3 g/cm3?
A. The asteroid is made of fragments only loosely held together by gravity. B. The asteroid contains an unusually large quantity of helium. C. The asteroid is of the stony type, not the iron type. D. The asteroid contains significant quantities of icy compounds.
The energy density of an electromagnetic wave in free space is
A) entirely in the electric field. B) entirely in the magnetic field. C) 1/4 in the electric field and 3/4 in the magnetic field. D) 1/4 in the magnetic field and 3/4 in the electric field. E) equally divided between the magnetic and the electric fields.