The lowest permitted energy level of an atom is called the neutral state
a. True
b. False
Indicate whether the statement is true or false
False
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Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00-cm-wide slit. What is the total angular width (2?) of diffracted sound waves when the speed of sound in air is 340 m/s
a. 167° b. 83.6° c. 19.5° d. 41.8° e. 0.11°
A gas eventually will escape from a planet's atmosphere if the average velocity of the atoms exceeds 1/6 times the escape velocity of the planet. If the average velocity of water vapor in Venus's atmosphere is 0.9 km/s, would it eventually escape into outer space? Note that Venus's mass is 5 × 1024 kg, and its radius is 6,050 km.
a. Water vapor would escape because 1/6 times the escape velocity is 0.51 km/s. b. Water vapor would not escape because 1/6 times the escape velocity is 1.7 km/s. c. Water vapor would escape because 1/6 times the escape velocity is 0.42 km/s. d. Water vapor would not escape because 1/6 times the escape velocity is 2.6 km/s. e. Water vapor would escape because 1/6 times the escape velocity is 1.3 km/s.
A 5-kg shark swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after his meal is
A) 1/2 m/s. B) 1/5 m/s. C) 1/6 m/s. D) 2/3 m/s. E) 3/2 m/s.
Based on human history, the likelihood that we will eventually colonize other habitable planets in our galaxy is
A) impossible to predict B) high C) zero D) low