HSC Science (General) 11th Standard - Maharashtra State Board Question Bank Solutions for Physics

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When sound waves travel from air to water, which of these remains constant?

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The Laplace’s correction in the expression for velocity of sound given by Newton is needed because sound waves

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Speed of sound is maximum in

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The walls of the hall built for music concerns should

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Describe a transverse wave.

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Define a longitudinal wave.

State Newton’s formula for the velocity of sound.

Solve Numerical example.

A monochromatic ray of light strike the water (n = 4/3) surface in a cylindrical vessel at angle of incidence 53°. Depth of water is 36 cm. After striking the water surface, how long will the light take to reach the bottom of the vessel? [Angles of the most popular Pythagorean triangle of sides in the ratio 3:4:5 are nearly 37°, 53°, and 90°]

Give reasons/short answer.

Prove that the current density of a metallic conductor is directly proportional to the drift speed of electrons.

Solve the following problem.

A current 4A flows through an automobile headlight. How many electrons flow through the headlight in a time 2hrs?

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Magnetic meridian is the plane

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The direction of the EM wave is given by

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State two characteristics of an EM wave.

Solve the numerical problem.

The amplitude of the magnetic field part of a harmonic EM wave in a vacuum is B₀ = 5 × 10⁻⁷ T. What is the amplitude of the electric field part of the wave?

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Electric conduction through a semiconductor is due to:

Answer the following question.

What is the importance of the energy gap in a semiconductor?

Distinguish between action spectrum and absorption spectrum.

Answer the following question.

Why is photolysis of water accompanied with non-cyclic photophosphorylation?

Define emissive power and coefficient of emmision of a body.

A metal sphere cools at the rate of 4°C / min. when its temperature is 50°C. Find its rate of cooling at 45°C if the temperature of surroundings is 25°C.