What determines rpm in lab equipment?

What determines rpm in lab equipment?

• A. Tachometer/strobe light
• B. Thermometer
• C. pH meter
• D. Barometer

Answer: (A)

Rotational speed, or rpm, is a measure of how fast a device spins. To know or control that speed in lab equipment, you need a tool that directly reads how fast the rotation is happening. A tachometer gives a direct rpm reading, and a strobe light helps you determine rpm by visually matching the flash rate to the rotation. These options specifically measure or reveal how fast something turns. The thermometer, pH meter, and barometer measure temperature, acidity, and air pressure, respectively—properties unrelated to rotation speed. So the tachometer or strobe light is the appropriate tool for determining rpm.

Rotational speed, or rpm, is a measure of how fast a device spins. To know or control that speed in lab equipment, you need a tool that directly reads how fast the rotation is happening. A tachometer gives a direct rpm reading, and a strobe light helps you determine rpm by visually matching the flash rate to the rotation. These options specifically measure or reveal how fast something turns. The thermometer, pH meter, and barometer measure temperature, acidity, and air pressure, respectively—properties unrelated to rotation speed. So the tachometer or strobe light is the appropriate tool for determining rpm.