If we say that a material is opaque to ultraviolet light, we mean that it ________
A) emits ultraviolet light B) absorbs ultraviolet light
C) reflects ultraviolet light D) transmits ultraviolet light
B
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Which one of the words below is a name for a type of galaxy in the Hubble classification system?
a. red giant b. visual c. spiral d. 21-centimeter e. statuesque
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in parallel across the same 120-volt source, the current drawn from the source remains at 6 amperes
a. True b. False Indicate whether the statement is true or false
For what wavelength does a 100-mW laser beam deliver 1.6 × 1017 photons in one second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 320 nm B) 340 nm C) 330 nm D) 350 nm
The universe's density, compared to the critical density, determines the ________ of space
Fill in the blank(s) with correct word