Monochromatic light of frequency 6.0×1014 Hz is produced by a laser. The power emitted is 2.0×10-3 W. How many photons per second, on average, are emitted by the source?

1. 6×10152. 5×10143. 6×10144. 5×1015

Subtopic:  Particle Nature of Light |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

The work function of caesium is 2.14 eV. The threshold frequency for caesium is:

1. 5.03×1012 Hz2. 6.12×1014 Hz3. 5.16×1014 Hz4. 6.51×1012 Hz

Subtopic:  Particle Nature of Light |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

The work function of caesium is 2.14 eV. The wavelength of incident light if the photocurrent is brought to zero by a stopping potential of 0.60 V will be:

1. 454 nm

2. 440 nm

3. 333 nm

4. 350 nm

Subtopic:  Einstein's Photoelectric Equation |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

The wavelength of light in the visible region is about 390 nm for violet colour. The energy of photons in (eV) is:

Take h=6.63×10-34 Js, and 1 eV=1.6×10-19 J

1. 1.64 eV

2. 2.26 eV

3. 3.19 eV

4. 4.03 eV

Subtopic:  Photoelectric Effect: Experiment |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

What is the de-Broglie wavelength associated with an electron moving at a speed of 5.4×106 m/s?

1. 0.244 nm

2. 0.135 nm

3. 0.157 nm

4. 0.111 nm

Subtopic:  De-broglie Wavelength |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

The de Broglie wavelength associated with a ball of mass 150 g travelling at a speed of 30.0 m/s is:

1. 1.47×10-32 m2. 2.01×10-34 m3. 2.01×10-32 m4. 1.47×10-34 m

Subtopic:  De-broglie Wavelength |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

An electron, an α-particle, and a proton have the same kinetic energy. Which of these particles has the shortest de Broglie wavelength?

1. Electron

2. α-particle

3. proton

4. All have the same de Broglie wavelength

Subtopic:  De-broglie Wavelength |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

A particle is moving three times as fast as an electron. The ratio of the de Broglie wavelength of the particle to that of the electron is 1.813×10-4. The particle’s mass is:

1. 9.371×10-31 kg2. 9.001×10-31 kg3. 1.675×10-27 kg4. 2.705×10-27 kg

Subtopic:  De-broglie Wavelength |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

What is the de Broglie wavelength associated with an electron, accelerated through a potential difference of 100 volts?

1. 0.123 nm

2. 0.232 nm

3. 0.031 nm

4. 0.312 nm

Subtopic:  De-broglie Wavelength |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology

The wavelength of light in the visible region is about 550 nm (average wavelength) for yellow-green colour. Three materials with work functions are given as Al (4.28 eV), Cu (4.65 eV) and Na (2.75 eV). From which of these photosensitive materials, can you build a photoelectric device that operates with visible light?

(1) Al

(2) Cu

(3) Na

(4) None of the above

Subtopic:  Photoelectric Effect: Experiment |
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2023 - Target Batch - Aryan Raj Singh
Please attempt this question first.
Launched MCQ Practice Books

Prefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot

NEET MCQ Books for 11th Physics, Chemistry & Biology