A guitar string of mass mm under tension resonates in its fundamental mode outside the ear canal and the string produces resonance in the ear's fundamental mode and so is perceived at maximum loudness. A second guitar string of different mass but of the same length and under the same tension again vibrates in the fundamental mode. The new string is designed to produce a resonance in the next higher harmonic of the ear. What should be the mass of the the new string in terms of the original mass mm

1 a

2 b

3 b

4 d

5 d

6 d

explanation:

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.