Physics - Study Mode

[#291] Which determines the frequency of a sound wave?
Correct Answer

(A) Amplitude

Explanation

Solution: Amplitude determines the frequency of a sound wave.

[#292] In a photocell light energy is converted into
Correct Answer

(D) Electrical energy

Explanation

Solution: A photocell converts light energy into electrical energy.

[#293] A voltaic cell converts chemical energy to
Correct Answer

(B) Electrical energy

Explanation

Solution: A galvanic (voltaic) cell converts the energy released by a spontaneous chemical reaction to electrical energy.

[#294] The work done by the string of a simple pendulum during one complete oscillation is equal to
Correct Answer

(D) Zero

Explanation

Solution: Work done by the string of the simple pendulum during one complete oscillation is zero. Pressure in the string precisely drops the segment parallel to the string.

[#295] Conversion of sound energy into electrical energy is done by
Correct Answer

(C) Microphone

Explanation

Solution: Conversion of sound energy into electrical energy is done by microphone.