The planets of the solar system were formed:
a) by the collapse of a single higher mass star into a black hole
b) by a near collision between the Sun and a nearby star
c) as condensations/accretions of hot gases ejected from the Sun
d) by the accumulation of many comets
e) as individual condensation/accretion centers in a rotating solarnebula
Ans: e) as individual condensation/accretion centers in a rotating solarnebula
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A photon of wavelength 1.50 × 10-10 m is scattered at an angle of 90° in the Compton effect. The wavelength of the scattered photon is
A) 1.52 × 10-10 m B) 1.49 × 10-10 m C) 1.48 × 10-10 m D) 1.51 × 10-10 m E) 1.50 × 10-10 m
The chief hazard of radiation damage to living cells is
A) due to heating. B) due to ionization. C) due to the creation of chemical impurities. D) the creation of new isotopes within the body. E) the creation of radioactive material within the body.
Which of the following statements about x-rays and radio waves is true?
A) X-rays have the same wavelengths as radio waves. B) X-rays have the same frequency as radio waves. C) X-rays have the same energy as radio waves. D) X-rays travel through space at the same speed as radio waves.
The flattening of a spherical body, usually caused by rotation, is referred to as__________
A) oblateness B) occultation C) collimation D) waning