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Kepler found the orbits of planets are circles, not ellipses.

A planet (or comet) will speed up as it recedes away from the Sun.

Changing the electric field will affect the magnetic field of a body.

A wave’s velocity is the product of the

The time for the Moon to orbit Earth, relative to the stars is 

The element first found in the Sun’s spectrum, then on Earth 30 years later, is:

According to Wien’s law, the wavelength of the peak energy will be __________ if the temperature of the blackbody is doubled.

If a wave’s frequency doubles and its speed stays constant, its wavelength

In Bohr’s model of the atom, electrons

Which of these is constant for all forms of electromagnetic (E-M) radiation in a vacuum?