Why do we think that quasars are extremely distant?
A. They are very bright.
B. They are very faint.
C. Their light varies rapidly.
D. Their spectra show immense redshifts.
Answer: D
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The shortest wavelength of visible light is _____
A) 300 nanometers B) 400 nanometers C) 500 nanometers D) 600 nanometers
The method of spectroscopic parallax cannot be applied to stars beyond about 100 pc
Indicate whether the statement is true or false
Doppler Effect: A whistle produces sound of frequency of 1.00 kHz. If a listener moves with a speed of 30 m/s away from the whistle, what frequency does this person hear if the sound speed is 340 m/s?
A. 912 Hz B. 919 Hz C. 1000 Hz D. 1090 Hz
A cubic box has sides of length 8.0 cm. What is the maximum number of pulverized spherical balls of diameter 1.5 cm that can fit inside the closed box (Vsphere = 4/3 ?r3)?
What will be an ideal response?