If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element? Why or why not?
What will be an ideal response?
We cannot conclude this, because it might be that the star is too hot or too cool for the electrons in a particular element to absorb photons.
You might also like to view...
A narrow slit is illuminated with sodium yellow light of wavelength 589 nm. If the central maximum extends to ±30.0°, how wide is the slit?
A. 0.500 mm B. 2.20 × 10?6 m C. 3.33 × 10?5 m D. 1.18 ?m E. 5.89 ?m
The flow rate of a liquid through a 2.0-cm radius pipe is 0.016 m3/s. The average fluid speed in the pipe is:
a. 0.64 m/s. c. 0.040 m/s. b. 13 m/s. d. 6.4 m/s.
Which of the following is not a piece of evidence supporting the idea that Europa may have a subsurface ocean?
A) Photos of Europa's surface show regions that appear to consist of jumbled icebergs frozen in place. B) Astronomers have detected small lakes of liquid water on Europa's surface. C) Europa has a magnetic field that appears to respond to Jupiter's magnetic field. D) Europa's surface shows very few impact craters.
A series combination of a 48.0-?F capacitor and a resistor are connected to a 12-V battery. After one second, the voltage across the capacitor is 10 V. What is the resistance of the resistor?
a. 11.6 k? b. 3.47 k? c. 37.3 k? d. 208 k?