When a pulse of white light is incident on a glass prism, the first color to emerge is
A) red.
B) orange.
C) green.
D) violet.
Answer: A
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A person is nearsighted with a far point of 75.0 cm. (a) What focal length contact lens is needed to give him normal vision? (b) What is the power of the corrective lens?
What will be an ideal response?
What happens if nearly saturated air experiences a quick, significant temperature drop?
A) Relative humidity drops. B) Relative humidity rises. C) Condensation occurs. D) Outcome depends on the temperature of the air.
A horizontal metal bar oriented east-west drops straight down in a location where Earth’s magnetic field is due north. As a result, an emf develops between the ends. Which end is positively charged?
1.the east end 2.the west end 3.neither end carries a current
Luminous (normal) matter makes up approximately what percentage of the known matter in the universe?
A) 15% B) 5% C) 60% D) 95%