HSC Science (Computer Science) इयत्ता ११ वी - Maharashtra State Board Question Bank Solutions

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The EM wave emitted by the Sun and responsible for heating the Earth’s atmosphere due to greenhouse effect is

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Earth’s atmosphere is richest in

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How does the frequency of a beam of ultraviolet light change when it travels from air into glass?

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Why are microwaves used in radar?

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Can we produce a pure electric or magnetic wave in space? Why?

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Does an ordinary electric lamp emit EM waves?

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Why light waves travel in a vacuum whereas sound waves cannot?

What are the ultraviolet rays?

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What are radio waves?

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Give two uses of ultraviolet rays.

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Give two uses of radio waves.

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Name the most harmful radiation entering the Earth's atmosphere from outer space.

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What is a carrier wave?

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Why high-frequency carrier waves are used for the transmission of audio signals?

Solve the numerical problem.

Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in a vacuum is 3.0 × 10⁸ m/s.

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Calculate the wavelength in nm of an X-ray wave of frequency 2.0 × 10¹⁸ Hz.

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The speed of light is 3 × 10⁸ m/s. Calculate the frequency of red light of a wavelength of 6.5 × 10⁻⁷ m.

Calculate the wavelength of a microwave of a frequency of 8.0 GHz.

Write the answer of the question with reference to laws of gravitation.

State the universal law of gravitation.

Answer the following question.

What are the dimensions of the universal gravitational constant?