The school auditorium was being rebuilt. When the orchestra practiced during construction, the sound seemed to bounce all around the room. Before the concert, workers installed thick panels of light material with many holes. The sound was very different during the concert. Explain what happened to cause the change in sound.

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

In a vernier instrument the main scale is in 1/2 mm divisions .vernier is made by redividing 19 such divisions into 20 equal parts. calculate the least count of the instrument.

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?