Galactic redshifts indicate the ________ of the universe.
Fill in the blank(s) with the appropriate word(s).
expansion
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Because of the scattering of light by dense clouds, the stars appear bluer than they should for their respective spectral types
Indicate whether the statement is true or false
Which statement is correct?
A. Only radial-velocity and transit methods reveal the radius of the planet. B. Only direct imaging and gravitational lensing methods reveal the mass of the planet. C. Only radial-velocity and gravitational lensing methods reveal the mass of the planet. D. Only direct imaging and transit methods reveal the radius of the planet. E. None of these choices are correct.
Mars and Mercury are similar in size, and Mercury is even denser. Why then is it Mars that has more atmosphere?
What will be an ideal response?
The primary of an ideal transformer has 100 turns and its secondary has 200 turns. Neglecting frictional losses, if the power input to the primary is 100 W, we can expect the power output of the secondary to be
A) 100 W. B) 50 W. C) 200 W. D) none of the given answers.