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

Physics & Space Science

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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

Physics & Space Science

As the air cools at night the relative humidity usually drops

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

Light being amplified by stimulated emission of radiation is the principle of the photoelectric effect

Indicate whether the statement is true or false

Physics & Space Science

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

Physics & Space Science