The focal length of the objective of a telescope is much longer than the focal length of the eyepiece
Indicate whether the statement is true or false
TRUE
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A telescope whose objective is a lens and contains no mirrors is a(n) ____ telescope
a. Refracting b. Reflecting c. Deflecting d. Compound e. Retracting
An excited hydrogen atom is capable of emitting radiation of
A) a single frequency. B) three frequencies. C) many more than three frequencies.
A 460-turn solenoid of length 30.0 cm and radius 4.00 cm carries a current of 3.50 A. What is the magnetic field strength inside the coil at its midpoint?What is the magnetic flux through a circular cross-sectional area of the solenoid at its midpoint?
a. 1.02E–5 T/m2 b. 3.05E–6 T/m2 c. 2.49E–7 T/m2 d. 3.39E–5 T/m2
Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges ?Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384 000 km and the mass of the Moon is 7.35 × 10^22 kg