An opaque object 10 cm wide casts a shadow when placed in a beam of light but has little effect on a beam of sound emitted by a small source of frequency 500 Hz. This is because
a. sound is a pressure wave whereas light is an electromagnetic waves
b. sound travels much more slowly than light
c. sound waves are longitudinal whereas light waves are transverse
d. sound waves have a much longer wavelength than light waves
e. the power per unit area in a beam of sound is much lower than that in a beam of light
The Attempt at a Solution
I don't know the relation between the choices and the question. I know that sound is longitudinal and light is transverse, I know the speed of sound and light. But I don't know how to use the info to answer the question.