Spherical Mirrors: An upright object is 50 cm from a concave mirror of radius 60 cm. The character of the image is
A. real and upright.
B. real and inverted.
C. virtual and upright.
D. virtual and inverted.
Answer: B
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Which statement is true?
A. Some electromagnetic waves will pass through walls that light cannot penetrate B. Electromagnetic waves can't travel in perfect vacuum C. Radio waves in the AM band are not electromagnetic waves D. Speed of light in air is lower than in glass E. In air light travels much faster than radiation from a microwave oven
Wave energy can only be transmitted through a material medium
Indicate whether the statement is true or false
A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate heat into empty space? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 7.1 W B) 0.71 mW C) 1.4 kW D) 9.9 mW E) 3.7 W
Which of the following stars would exhibit the largest amount of stellar parallax?
A) the star that is nearest to us B) the star that is farthest from us C) the star that is brightest in our sky D) the star that is dimmest in our sky E) the star that is moving at the highest speed relative to Earth