What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state ni = 4 jumps to the final state nf = 2?
A) 243.1 nm
B) 556.2 nm
C) 486.2 nm
D) 312.2 nm
E) 609.1 nm
C
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An AC series circuit contains a resistor of 20.0 ?, an inductor of 74.0 mH and a variable capacitor. If the frequency of the applied voltage is 423 Hz, to what setting should the capacitor be set if resonance is achieved?
a. 1.89E–5 F b. 7.66E–6 F c. 5.09E–6 F d. 1.91E–6 F e. 1.91E–5 F
Equilibrium: A very light wire is used to hang a series of 8.0-kg bricks. This wire will break if the tension in it exceeds 450 N. The bricks are hung one below the other from a hook in the ceiling using this wire, as shown in the figure.(a) How many whole bricks can be hung without breaking the wire?(b) If you add one more brick to the number found in part (a), which string will break?
What will be an ideal response?
Our present days of the week are related to the names of the Sun, the Moon, and ______________ planets
Fill in the blank(s) with correct word
Why do spiral arms have a blue color?
What will be an ideal response?