An ultraviolet lamp, above zinc's threshold frequency, ejects a steady stream of electrons from a zinc plate. Vasco doubles the lamp's brightness. The stream grows: more electrons leave the plate every second.
Above the threshold, light ejects electrons. The next two lessons each change one thing about the light and hold the other fixed. This lesson raises the intensity and keeps the frequency the same.
Suppose light above a metal's threshold frequency is ejecting electrons from the metal.
The frequency stays the same, and still the count climbs with the intensity.
Doubling the brightness of an ultraviolet lamp on zinc, frequency unchanged, ejects more electrons from the zinc each second.
A more intense light delivers more energy to the plate each second, and more electrons leave each second.
Intensity controls how many electrons leave each second; what the frequency controls is the next lesson's measurement.
A violet lamp above sodium's threshold frequency ejects electrons from a sodium plate. Zelda triples the lamp's intensity without changing its frequency. What happens to the ejection?
Above the threshold, increasing the intensity increases the number of electrons ejected each second.
The frequency has not changed, so the light stays above the threshold and ejection continues.
The more intense light ejects more electrons each second.
More electrons leave the sodium each second.
An ultraviolet lamp above zinc's threshold frequency is slowly dimmed, without changing its frequency. What happens to the number of electrons ejected each second?
Dimming lowers the light's intensity.
Above the threshold, a lower intensity means fewer electrons ejected each second.
The light stays above the threshold, so some electrons still leave while the lamp is on.
Fewer electrons leave the zinc each second.
An ultraviolet lamp above zinc's threshold frequency lights a zinc plate. Una doubles the lamp's brightness and keeps its frequency the same. What happens to the number of electrons ejected each second?
Xiomara says: 'Making above-threshold light more intense ejects more electrons from the metal each second.' Is Xiomara correct?
Vasco says: 'A brighter lamp ejects more electrons each second than a dimmer one, even when both lamps are below the metal's threshold frequency.' Is Vasco correct?
Blue light above potassium's threshold frequency ejects electrons from a potassium strip. The lamp's intensity is halved; its frequency is unchanged. Which statement is correct?
A lamp above a metal's threshold frequency ejects a steady 100 electrons from a plate each second. One single change to the lamp raises that count, with ejection still starting instantly. Which change was made?
An ultraviolet lamp on zinc is made brighter, with its frequency unchanged. Which quantity increases?