The wavelength and frequency of the H α line of hydrogen gas in a laboratory in which the discharge tube produces first-order bright band at a distance of 17.4 cm from the central maxima if a grating spectrograph has 5000 lines/cm and is placed by a distance of 0.500 m from the film.
The wavelength and frequency of the H α line of hydrogen gas in a laboratory in which the discharge tube produces first-order bright band at a distance of 17.4 cm from the central maxima if a grating spectrograph has 5000 lines/cm and is placed by a distance of 0.500 m from the film.
Solution Summary: The author analyzes the wavelength and frequency of the hydrogen gas line in a laboratory where the discharge tube produces first-order bright bands.
The wavelength and frequency of the Hα line of hydrogen gas in a laboratory in which the discharge tube produces first-order bright band at a distance of 17.4 cm from the central maxima if a grating spectrograph has 5000 lines/cm and is placed by a distance of 0.500 m from the film.
(b)
To determine
The wavelength and frequency of the Hα line coming from the galaxy in a cluster. Hydra A produces first-order bright band at a distance of 18.4 cm from the central maxima if the grating spectrograph has 5000 lines/cm and is placed at 0.500 m from the thin film.
(c)
To determine
The possible reason for the frequency differences of Hα line from the galaxy and Hα line from the lab source if the grating spectrograph has 5000 lines/cm and is placed at a distance of 0.500 m from the thin film.
6. A car drives at steady speed around a perfectly
circular track.
(a) The car's acceleration is zero.
(b) The net force on the car is zero.
(c) Both the acceleration and net force on the car
point outward.
(d) Both the acceleration and net force on the car
point inward.
(e) If there is no friction, the acceleration is
outward.
9. A spring has a force constant of 100 N/m and an
unstretched length of 0.07 m. One end is attached to
a post that is free to rotate in the center of a smooth.
table, as shown in the top view in the figure below.
The other end is attached to a 1kg disc moving in
uniform circular motion on the table, which
stretches the spring by 0.03 m. Friction is negligible.
What is the centripetal force on the disc?
Top View
(a)
0.3 N
(b)
3.0 N
(c)
10 N
(d)
300 N
(e)
1000 N
4. A child has a ball on the end of a cord, and whirls
the ball in a vertical circle. Assuming the speed of
the ball is constant (an approximation), when would
the tension in the cord be greatest?
(a) At the top of the circle.
(b) At the bottom of the circle.
(c) A little after the bottom of the circle when the
ball is climbing.
(d) A little before the bottom of the circle when the
ball is descending quickly.
(e) Nowhere; the cord is pulled the same amount at
all points.
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