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Consider the following statements : Statement - I : When an ultrasound travels from one medium to the other medium, its wavelength, frequency and speed change. Statement - II : The frequency of an ultrasound wave remains almost unchanged while travelling from one medium to the other medium. Statement - III: The frequency and speed of an ultrasound wave change when travelling from one medium to the other medium. Statement - IV : ‘Echocardiography’ – a technique used in medical diagnostics, employs ultrasound. Which of the following combination of above statements are true?
This question appeared in the HPSC Prelims 2021 examination (GS-II). It is Question 67 out of 198 questions in this paper.
This question was part of the HPSC Prelims 2021 (GS-II). The HPSC Prelims examination tests candidates on general studies, current affairs, and aptitude through multiple-choice questions.
Practice previous year questions from all HPSC Prelims papers and compare patterns with UPSC Prelims PYQ to identify overlapping topics.