" 1) How does Evelyn 'hear' the music? "

How does Evelyn hear music?

How do we hear sound?

Explain the following : (a) How does the middle ear help in hearing ? (b) Why does vitamin A deficiency produce night-blindness ? (c ) What is the role of lacrimal gland ? (d) How does the iris adjust the size of the pupil ?

How ear helps in hearing ?

John places an alarm clock inside a box as shown in the given figure. He then creates a vacuum inside the box. When the alarm goes on, John does not hear the alarm-sound. John does not hear the alarm sound because

At what speed should a car approach a stationary observer if the hears the music of the car radio with a frequency 20% higher than it actully is ? The speed of sound is 340 ms^(-1)