The crescent shapes of spots of light cast through openings in trees occurs with a
A) partial eclipse of the Sun.
B) total eclipse of the Sun.
C) lunar eclipse, partial or total.
D) partial lunar eclipse.
Answer: B
You might also like to view...
An electron in an infinite potential well (a box) makes a transition from the n = 3 level to the ground state and in so doing emits a photon of wavelength 20.9 nm. (c = 3.00 × 108 m/s, h = 6.626 × 10-34J ? s, mel = 9.11 × 10-31 kg)
(a) What is the width of this well? (b) What wavelength photon would be required to excite the electron from its original level to the next higher one? What will be an ideal response?
Einstein's equivalence principle says that
A) everyone measures the speed of light to be equivalent. B) the effects of gravity are exactly equivalent to the effects of acceleration. C) someone traveling at 0.9c will age at the same rate as someone at 0.99c. D) all people see themselves at an equivalent distance to the center of the universe.
Background radiation from cosmic rays and radioactive nuclei in our surroundings is about 0.13 rem/year. Suppose we assume this all comes from cosmic rays which have an RBE factor of 1.0 . The RBE factor for the most dangerous types of radiation is 20 . How many rads of the most dangerous radiation could a 100-year-old person have been exposed to in her lifetime without having gone over the
recommended limit of 0.5 rem/year? a. 0.37 b. 0.50 c. 1.85 d. 13 e. 37
The organisms with the next highest Encephalization Quotient (EQ) ratios after humans are
A) dolphins B) humans C) whales D) chimps