An electron is emitted in both positive and negative beta decay, although the positive one is called positron emission.
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[two waves] pass a point [every second]... The answer is in the question (B)
Answer:
Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process. Two common forms of latent heat are latent heat of fusion (melting) and latent heat of vaporization (boiling).
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