Physics
Matter waves are

Electromagnetic waves
De Broglie waves
Transverse waves
Longitudinal waves

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is more than that between concrete and feet.
the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.
sand is soft and concreter is hard.

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Physics
Dynamo is a device for converting

Mechanical energy into electrical energy
Magnetic energy into electrical energy
Heat energy into electrical energy
Chemical energy into electrical energy

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