The portion of the electromagnetic spectrum between the 21 cm line of neutral hydrogen and the 18 cm line of OH is known as the ____________________
Fill in the blank(s) with correct word
water hole
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The average star spends ____ of its lifetime on the main sequence
a. 1% b. 2% c. 10% d. 20% e. 90%
A square coil (length of side = 24 cm) of wire consisting of two turns is placed in a uniform magnetic field that makes an angle of 60° with the plane of the coil. If the magnitude of this field increases by 6.0 mT every 10 ms, what is the magnitude of the emf induced in the coil?
A. 55 mV B. 46 mV C. 50 mV D. 60 mV E. 35 mV
A long solenoid (n = 1 500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V b. 1.0 V c. 6.8 V d. 0.68 V e. 1.4 V
A wave pulse on a string whose end is free is reflected without inversion
Indicate whether the statement is true or false