The photoelectric effect shows that light behaves as
Answer and explanation
Correct answer: A. particles called photons
- Step 1: Each photon carries an energy hf, and an electron is released only if hf exceeds the work function. Answer: particles called photons. Why not the others: only a continuous wave: A wave model cannot explain the threshold frequency. sound: Light is not sound. a stream of electrons: Electrons are emitted, not the light itself.
Practise more Electricity, waves and modern physics.
Free questions with an explanation for every one, and full timed CSAT Suneung mock tests.
More Electricity, waves and modern physics questions
- A 12 V battery is connected across a 4 ohm resistor and a 2 ohm resistor in series. What is the current?
- A 6 ohm and a 3 ohm resistor are connected in parallel across a 6 V supply. What is the total current?
- An appliance rated 1500 W is switched on for 2 hours. How much energy does it use in kWh?
- A wave on a string has a frequency of 5 Hz and a wavelength of 0.4 m. What is its speed?
- A sound wave has a speed of 340 m/s and a frequency of 170 Hz. What is its wavelength?
- Which colour of visible light has the highest frequency?