Question

Assignment Book nic: Electromagnetic Energy Use this diagram to cwer questions 47 and 48 sample Notary Heitorage son laboratory sample laboratory CALC D 47. Laboratory specimen X contains elements A. H and He only B. Li only C. H. He, and Li only D. H and Li only o 48. The spectrum from star number one indicates that A. it is moving toward us B. it is moving away from us C. it's not moving relative to us © 49. Astronomers compared the spectra from two different stars in our galaxy. It was noted that the Doppler shift suggested that the two stars are moving relative to us with the same speed. It was also noted that the stars moved relative to us with different velocities. Explain how this can be true. 2 ADLC I Science 30

Answer 1

6 7 6 5 4 3 2 Ans.) 47) By comparing the spectia of x with different elements it can be seen that. X laboratory sample lines 2, 3, 5 and 7 are present in Li Lines 4 and are present in te Linex 1, 4, 7, 8 and a are present in t there are 4 lines in the spectrum of Li and all are present in pre specke mos X. Similarly there are 5 lines in t and all are present in X. Hence. sample contains option D is correct It and Lionly

48) Comparision of spectrum of star #1 and that of He reveals that they are same except the spectrum of star #has shifted towards the red enda. Hence the star is moving away from us. option 'R' is correct 49) It may be so that one stes is moving away from us and the other towards wwith same speed. Their velocities would be different is velouty is a recta. Since they are moving with same speed, hence same Doppler shift would be segistered