A sonometer wire having a length of 50 cm is vibrating in the fundamental mode with a frequency of 100 Hz. Which of the following is the type of propagating wave and its speed?

The standing wave pattern along a string of length 60 cm is shown in the above diagram. If the speed of the transverse wave on this string is 300 m/s, in which one of the folowing modes is the string vibrating?

Match List I with List II and select the correct answer using the code given below the lists

How far must a girl stand in front of a concave spherical mirror of radius 120cm to see an erect image of her face four times its natural size?

If an α-particle is projected normally through a uniform magnetic field, then the path of the α-particle inside the field will be

Which among the following is the necessary condition for simple harmonic motion?