The correct answer is (b) 1.4 m. The wavelength (λ) is calculated using the formula: λ = v/f where v = 350 m/s (velocity of sound) and f = 250 Hz (frequency). λ = 350/250 = 1.4m. Class 9th Science ...
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The correct answer is (c) Frequency. When a sound wave moves from air to water, its speed and wavelength change due to the difference in medium density. However, frequency remains unchanged because it depends only on the source of the ...
The correct answer is (c) 200 Hz. The frequency (f) is given by the formula: F = 1/T where T = 0.005 s. F = 1/0.005 = 200 Hz. Class 9th Science NCERT MCQ Questions NCERT Books MCQ Questions Session ...
The correct answer is (b) 1815 m. The distance is calculated using distance = speed × time. Given the speed of sound as 330 m/s and time as 5.5 s, the distance is 330 × 5.5 = 1815 m. Class ...
The correct answer is (a) sound will be louder but pitch will not be different. Loudness depends on the amplitude of vibration, which increases when the key is struck harder. However, pitch depends on frequency, which remains unchanged as it ...