We are not yet capable of detecting life on planets around other stars. But as our technology develops, our first real chance of detecting such life will probably come from
A) examining spectral lines from the atmospheres of distant planets.
B) sending spacecraft to study the planets up close.
C) examining high-resolution images of the planets made by orbiting telescopes.
D) determining the orbital properties of the planets.
A) examining spectral lines from the atmospheres of distant planets.
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Unpolarized light is passed through three successive Polaroid filters, each with its transmission axis at 45.0° to the preceding filter. What percentage of light gets through?
a. 0% b. 12.5% c. 25.0% d. 50.0% e. 33.3%
LR Circuits: A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit and replaced by a wire to complete the circuit. The time constant for of the new circuit represents the time required for the current to decrease to
A. 25% of the original value. B. 37% of the original value. C. 63% of the original value. D. 75% of the original value. E. zero.
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion. A heavy truck hits a small car. At any given time during the impact,
a. the force the truck exerts on the car is larger than the force the car exerts on the truck b. the force the truck exerts on the car is smaller than the force the car exerts on the truck c. the force the truck exerts on the car is equal to the force the car exerts on the truck d. the only force present is the force of the truck on the car
Which hypothesis concerning the formation of the Moon makes predictions that best fit the observed lunar data?
a. The large impact hypothesis b. The fission hypothesis c. The capture hypothesis d. The condensation hypothesis e. The regolith hypothesis