Physics - Study Mode

[#796] Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?
Correct Answer

(B) It follows the wave path near the tropopause at elevations of 8 km to 15 km.

Explanation

Solution: It follows the wave path near the tropopause at elevations of 8 km to 15 km, this statement is not correct.

[#797] In a ________ the wave particles of the medium vibrate in a direction perpendicular to the direction of wave propagation
Correct Answer

(C) Transverse

Explanation

Solution: In transverse waves, particle of the medium vibrate in a direction perpendicular to the direction of wave motion.

[#798] Which of the following is the unit of perceived loudness of sound ?
Correct Answer

(B) Sone

Explanation

Solution: Loudness is a subjective characteristic of a sound (as opposed to the sound-pressure level in decibels, which is objective and directly measurable). Perceived loudness of sound is a psycho-acoustic quantity that depends on sound pressure level, the frequency spectrum, and the time behavior of the sound in question. The sone is a unit of perceived loudness that was proposed by Stanley Smith Stevens in 1936.Being a unit of how loud a sound is perceived, the sone scale of loudness is based on data obtained from subjects who were asked to judge the loudness of pure tones and noise. One sone is arbitrarily set equal to the loudness of a 1,000-hertz tone at a sound level of 40 decibels (Encyclopedia Britannica).

[#799] The component used for tuning a radio is basically a variable
Correct Answer

(B) Condenser

Explanation

Solution: The component used for tuning a radio is basically a variable condenser.

[#800] A wave with high amplitude have
Correct Answer

(C) High energy

Explanation

Solution: A wave with a large amplitude will be particularly tall, and a wave with a small aptitude will be particularly short. It turns out that the amplitude tells you how much energy is in the wave. A high amplitude wave is a high-energy wave, and a low-amplitude wave is a low-energy wave.