21.We superimpose two sound waves of the same frequency but traveling in opposit

Question

21.We superimpose two sound waves of the same frequency but traveling in opposite directions. The result is beats a sonic boom O a Doppler shift a standing wave 22. An electron falls from one energy level to another and emitsde a photon. If we increase the separation in energy betweenglapsed: ns the two levels, the photon will have O a lower frequency. the samee a higher 23. Suppose we are traveling near the speed of light from one star to another. As we increase our speed, the distance between these two stars will appear to decrease remain the same increase 24.The nucleus 8635Br is radioactive. It decays to 836Kr and emits an O electron positron O alpha particle none of these

Explanation / Answer

22.

higher frequency

as the energy separation between the two levels is increased, the electron goes through larger energy change and hence the energy of photon emitted will also be larger. due to higher energy of photon , the frequency of photon will be higher since energy of photon is directly propotional to frequency.

23.

decrease

this happen due to the phenomenon of length contraction at speeds comparable to speed of light.

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