Potential energy may be positive or negative

Indicate whether the statement is true or false


TRUE

Physics & Space Science

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Photon Energy: An 84-kW AM radio station broadcasts at 1000 kHz. How many photons are emitted each second by the transmitting antenna? (h = 6.626 × 10-34 J ? s)

A. 1.3 × 1032 B. 2.9 × 1024 C. 6.3 × 1012 D. 1.4 × 1015

Physics & Space Science

A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the

A) force against the cannon is smaller than against the ball. B) momentum is mainly concentrated in the cannonball. C) cannon has much more mass than the cannonball. D) momentum of the cannon is smaller.

Physics & Space Science

The amount of energy equivalent to one kilogram of mass at rest is

A) 9.0 × 1016 J. B) 3.0 × 108 J. C) 4.5 × 1016 J. D) 6.0 × 10-3 eV. E) 1.2 × 108 eV.

Physics & Space Science

Of the main types of radiation emitted from naturally radioactive isotopes, which of the following is the most penetrating?

a. alpha b. beta (electron) c. gamma d. beta (positron)

Physics & Space Science