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Dual Nature of Radiation and Matter

Easy Questions

Modern Physics

Dual Nature of Radiation and Matter
Atoms
Nuclei
Semiconductor Electronics : Materials, Devices and Simple Circuits
  1. The 21 cm radio wave emitted by hydrogen in interstellar space is due to the interaction called the hyperfine interaction in atomic hydrogen. The energy of the emitted wave is nearly
    1. 10–17 J
    2. 1 J
    3. 7 × 10–8 J
    4. 10–24 J
Correct Option: D

E = hv =
hc
=
6.6 × 10-34 × 3 × 108
λ0.21

=
6.6
× 10-24 = 0.94 × 10-24 J
7


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