centerpiece
stringclasses 4
values | options
sequence | correct_options
sequence | correct_options_idx
sequence | correct_options_literal
sequence |
|---|---|---|---|---|
A pipe full of air is closed at one end. A standing wave is produced in the pipe, causing the pipe to sound a note. Which of the following is a correct statement about the wave鈥檚 properties at the closed end of the pipe? | [
"The pressure is at a node, but the particle displacement is at an antinode.",
"The pressure is at an antinode, but the particle displacement is at a node.",
"The pressure and the particle displacement are both at nodes.",
"The pressure and the particle displacement are both at antinodes."
] | [
"B"
] | [
1
] | [
"The pressure is at an antinode, but the particle displacement is at a node."
] |
A photocell of work function 蠒 = 2eV is connected to a resistor in series. Light of frequency f = 1 脳 10^15 Hz hits a metal plate of the photocell. If the power of the light is P = 100 W, what is the current through the resistor? | [
"2:00 AM",
"6:00 AM",
"12:00 AM",
"24 A"
] | [
"D"
] | [
3
] | [
"24 A"
] |
A microwave oven is connected to an outlet, 120 V, and draws a current of 2 amps. At what rate is energy being used by the microwave oven? | [
"10 W",
"30 W",
"60 W",
"240 W"
] | [
"D"
] | [
3
] | [
"240 W"
] |
A point charge, Q = +1 mC, is fixed at the origin. How much work is required to move a charge, Q = +8 碌C, from the point (0, 4 meters) to the point (3 meters, 0)? | [
"3.5 J",
"6.0 J",
"22.5 J",
"40 J"
] | [
"B"
] | [
1
] | [
"6.0 J"
] |