HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

Discuss the following case-

Both are in motion

1. Source and Observer approach each other
2. Source and Observer resides from each other
3. Source chases Observer
4. Observer chases Source

The speed of a wave in a certain medium is 900 m/s. If 3000 waves passes over a certain point of the medium in 2 minutes, then compute its wavelength?

Consider a mixture of 2 mol of helium and 4 mol of oxygen. Compute the speed of sound in this gas mixture at 300 K.

A ship in a sea sends SONAR waves straight down into the seawater from the bottom of the ship. The signal reflects from the deep bottom bedrock and returns to the ship after 3.5 s. After the ship moves to 100 km it sends another signal which returns back after 2 s. Calculate the depth of the sea in each case and also compute the difference in height between two cases.

N tuning forks are arranged in order of increasing frequency and any two successive tuning forks give n beats per second when sounded together. If the last fork gives double the frequency of the first (called as octave), Show that the frequency of the first tuning fork is f = (N – 1)n.

A sound source and listener are both stationary and a strong wind is blowing. Is there a Doppler effect?

How do animals sense impending danger of hurricane?

If the temperature and pressure of a gas is doubled the mean free path of the gas molecules ____________.

Define mean free path and write down its expression.

List the factors affecting the mean free path.

What is the reason for the Brownian motion?

Derive the expression for the mean free path of the gas.

Calculate the mean free path of air molecules at STP. The diameter of N₂ and O₂ is about 3 × 10⁻¹⁰ m

Describe the Brownian motion.