3. (a). Which one of these statements about longitudinal waves is FALSE? Select

Question

3. (a). Which one of these statements about longitudinal waves is FALSE? Select one:

a. The speed of propagation of the wave and the oscillation speed of the oscillators are the same.

b. Longitudinal waves obey the same equations as transverse waves

c. A longitudinal wave has a direction of oscillation of the oscillating units (atoms etc) which is parallel to the propagation direction.

d. Sound is a longitudinal wave

(b) Which one of these is NOT a mechanism of heat transfer. Select one:

a. Radiation

b. Convection

c. Reflection

d. Conduction

(c) Which one of these statements about Black Body radiation is FALSE? Select one:

a. A black body re-radiates all energy which it absorbs

b. A black body may re-radiate energy at different wavelengths from the absorbed wavelengths

c. Black body radiation only occurs if the body is black

d. A black body is a perfect absorber of all wavelengths of radiation

Explanation / Answer

A) b.option b) is correct option. Longitudinal waves obey the same equations as transverse waves

B) option c) is correct option. Reflection.

C) option c) is correct option. Black body radiation only occurs if the body is black.

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