The four visible colors emitted by hydrogen atoms are produced by electrons:
a. that start in the ground state.
c. that end up in the level with n = 2.
b. that end up in the ground state.
d. that start in the level with n = 2.
C
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Star A and star B have the same apparent magnitude. Star A is twice as distant as star B. Therefore, star A has twice the luminosity as star B
Indicate whether the statement is true or false
Determine the resonant frequency of the circuit.
A. 159 Hz B. 32 Hz C. 5 Hz D. 500 Hz E. 79.5 Hz
Fissioning an iron nucleus would occur with
A) absorption of energy. B) release of energy. C) neither absorption nor release of energy
Star A has a radius of 200 000 km and a surface temperature of 6 000 K. Star B has a radius of 400 000 km and a surface temperature of 3 000 K. The emissivity of both stars is the same. What is the ratio of the rate of energy radiated by Star A to that of Star B?