railway RRB JE (CBT I + CBT II) Mock Test 2024 General Science Physics Wave

कम आवृत्ति वाली ध्वनि तरंग में _______ होगा।

1
कम आयाम
2
कम तरंगदैर्ध्य
3
ऊँची पिच
4
निम्न पिच
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