Question 25
Question 25 of 40
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Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
7. Waves
7.1. Progressive waves

understand the use of the time-base and y-gain of a cathode-ray oscilloscope (CRO) to determine frequency and amplitude

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define the specific acoustic impedance of a medium as Z = ρc, where c is the speed of sound in the medium

7. Waves
7.3. Doppler effect for sound waves

use the expression fo = fsν / (ν + νs) for the observed frequency when a source of sound waves moves relative to a stationary observer