Consider the following statements:

I. A flute of smaller length produces waves of lower frequency.

II. Sound travels in rocks in the form of longitudinal elastic waves only.

Which of the statement(s) given above is/are correct?

Assertion (A): Radiowaves bend in a magnetic field.

Reason (R): Radiowaves are electromagnetic in nature.

Consider the following statements:
I. Light of longer wavelength is scattered much more than the light of shorter wavelength.
II. The speed of visible light in water is $0.95$ times the speed in a vacuum.
III. Radio waves are produced by rapidly oscillating electrical currents.
IV. To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves.
Which of these statements are correct?

Assertion (A): The velocity of sound in air increases due to the presence of moisture in it.

Reason (R): The presence of moisture in air lowers the density of air.

Match List I (Electromagnetic radiation) with List II (Approximate wavelength in metre) and select the correct answer using the codes given below the lists.

Codes:

Consider the following statements:

I. Transverse waves occur when a disturbance creates oscillations perpendicular to the propagation.

II. Longitudinal waves occur when the oscillations are parallel to the direction of propagation.

Which of the following statement(s) given above is/are correct?

The velocity of sound in air is affected by change in the-

I. Moisture content of air

II. Temperature of air

III. Composition of air

IV. Atmospheric pressure

Choose the correct answer:

Consider the following statements:

I. In sound waves, the vibrations are perpendicular to the direction in which the wave travels.

II. Sound waves are elastic waves.

Which of the statement(s) given above is/are correct?