Spectrographs use a prism or a grating to spread starlight according to wavelength
a. True
b. False
Indicate whether the statement is true or false
True
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Given that the wavelengths of visible light range from 400 nm to 700 nm, what is the highest frequency of visible light? (c = 3.0 x 108 m/s)
A) 3.1 × 108 Hz B) 7.5 × 1014 Hz C) 2.3 × 1020 Hz D) 4.3 × 1014 Hz E) 5.0 × 108 Hz
How large must the coefficient of static friction be between the tires and the road if the car is to round a level curve of radius 85m at a speed of 95 km/h?
What will be an ideal response?
What temperature has the Big Bang has cooled to by now?
A) About 3,000 K B) 5,800 K C) About 300 K D) Just over 2.7K E) 1.4 K
A long solenoid (n = 1200 turns/m, radius = 2.0 cm) has a current of a 0.30 A in its winding. A long wire carrying a current of 20 A is parallel to and 1.0 cm from the axis of the solenoid. What is the magnitude of the resulting magnetic field at a point on the axis of the solenoid?
A. 0.60 mT B. 0.85 mT C. 52 ?T D. 0.40 mT E. 0.75 mT