The image formed by a candle located outside the focal point of a converging lens is real, inverted, and may be magnified or reduced in size, as shown. How could you experimentally distinguish between a real and a virtual image?
a. A real image will be projected on a piece of paper placed at the position of the image.
b. A virtual image will be projected on a piece of paper located at the position of the image.
c. One cannot distinguish between the two; both a. and b. are correct.
d. One cannot distinguish between the two; both a. and b. are incorrect.
a
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State Newton's 3rd law in your own words
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A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is
a. 3 minutes. b. 4 minutes. c. 6 minutes. d. 8 minutes. e. 12 minutes.
Do the Moon and Mercury have an atmosphere?
a. No, they entirely lost their atmospheres early on in their formation. b. Yes, they are very low-density atmospheres though. c. Yes, they have an atmosphere just like other terrestrial planets.
If air speed is greater along the top surface of a bird's wings, pressure of the moving air there is
A) unaffected. B) less. C) more. D) turbulent.