41. When a wave passes from one medium to another, there is change in
(a) frequency and velocity
(b) frequency and wavelength
(c) wavelength and velocity
(d) frequency, wavelength and velocity

42. A fork gives 5 beats with a 40 cm length of sonometre wire. If the length ofthe wire is shortened by 1 cm, the number of beats is still the same. The frequency of the fork is
(a) 385 Hz
(b) 600 Hz
(c) 395 Hz
(d) 400 Hz

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