Which fundamental quantity does the average person measure most often every day?

a. Mass
b. Length
c. Time
d. Electric charge


c

Physics & Space Science

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Which of the following has the highest frequency?

a) Ultraviolet b) Microwaves c) X-rays d) Radiowaves

Physics & Space Science

Parallel light incident on a positive lens will ________ as it emerges.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

Neutral hydrogen is most obvious in the electromagnetic spectrum:

A) in yellow light of the Sun's continuum. B) at 656.3 nm, hydrogen alpha red. C) at 21 cm in the radio region. D) at 121.3 nm, the Lyman alpha ultraviolet line. E) Neutral hydrogen has yet to be detected in space.

Physics & Space Science

The apparent amount of time it takes for Earth to complete a rotation on its axis is called a

a. meridian day. b. 24-hour day. c. sidereal day. d. mean solar day. e. solar day.

Physics & Space Science