We cannot hear the echo produced in a classroom.

Give scientific reasons Why cannot we hear the echo produced in a classroom?

Human ear cannot hear those mechanical waves whose frequency lies in the frequency range

Answer the following : How will you explain the statement 'we cannot see the objects in a dark room ' ?

Answer the following questions: Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.

A drone fitted with siren in flying directly away from the drone operator and towards a distant building at a speed of 15 m//s . The siren produces sound of frequency 780 Hz. What is the frequency that the operator hears in the echo reflected from the building (Speed of sound is 340 m//s ).

Give reasons : We cannot stand at one place for a long time . How can we sleep on a place for 8 and odd hours ?

Collect pictures of various useful microbes. Display chart of their information in classroom.

afires a gun. He heard the echo of the sounds from the first building after 2 seconds and echo i from the second building after 3 seconds. Find the distance between two buildings. (Speed of sound in air = 340 m/s )

The probability that a lamp in a classroom will be burnt out is 0.3.Six such lamps are fitted in the classroom.If it is known that the classroom is unusable if the number of lamps burning in it is less than four,find the probability that the classroom cannot be used on a random occasion.