A Doppler red shift indicates
a. a shift toward lower frequencies.
b. a shift toward longer wavelengths.
c. that a light source is receding relative to the observer.
d. all of these.
d
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As the air cools at night the relative humidity usually drops
a. True b. False Indicate whether the statement is true or false
Air at 30°C and 200 kPa is flowing in a 30-cm-diameter pipe and passes through the bend shown. An estimate of the pressure difference between the inside of the bend and the outside of the bend is approximately:
(A) 110 Pa
(B) 140 Pa
(C) 180 Pa
(D) 240 Pa
The main source of energy in main sequence stars is ________.
A. fusion of hydrogen to helium B. the triple alpha process C. gravity D. the chemical reaction between hydrogen and helium
Light being amplified by stimulated emission of radiation is the principle of the photoelectric effect
Indicate whether the statement is true or false