Maps of Venus have been made by
A. measuring seismic waves from earthquakes.
B. landing spacecraft on the surface to take pictures.
C. optical telescopic observations from Earth when the clouds part.
D. bouncing radio waves off the planet from satellites and Earth.
Answer: D
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The ozone layer lies in the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
An electron has the same de Broglie wavelength as a 390 nm photon. The speed of the electron is closest to:
A) 1,900 m/s B) 2,100 m/s C) 1,700m/s D) 1,500 m/s E) 540 m/s
To which group of polymers does Dacron belong?
a. Natural b. Hydrolytic c. Addition d. Condensation
Intensity: The average intensity of sunlight impinging on Earth is measured to be about 1.4 kW/m2. What is the power of sunlight emitted by the sun? (Earth-Sun distance = 1.5 × 108 km, Earth radius = 6.4 × 103 km)
A. 4.0 × 1026 W B. 3.2 × 1022 W C. 7.2 × 1014 W D. 7.6 × 108 W