Q17. The wave length of Red light in the visible region is about 760 nm the energy of photon in that

Q: What is the correct answer for CUET UG Physics Q17?

The correct answer is c. The energy of a photon (E) is given by the formula E = hc/λ, where:h (Planck's constant) = 6.626 × 10⁻³⁴ J·sc (speed of light) = 3 × 10⁸ m/sλ (wavelength) = 760 nm = 760 × 10⁻⁹ mE = (6.626 × 10⁻³⁴ J·s * 3 × 10⁸ m/s) / (760 × 10⁻⁹ m)E = (1.9878 × 10⁻²⁵ J·m) / (760 × 10⁻⁹ m)E ≈ 2.6155 × 10⁻¹⁹ J.To convert this energy to electron volts (eV), divide by the elementary charge (e = 1.602 × 10⁻¹⁹ J/eV).E_

Q: Q17. The wave length of Red light in the visible region is about 760 nm the energy of photon in that case will be: (a) 2.43 eV (b) 3.18 eV (c) 1.64 eV (d) 2.68 eV

The correct answer is c. The energy of a photon (E) is given by the formula E = hc/λ, where:h (Planck's constant) = 6.626 × 10⁻³⁴ J·sc (speed of light) = 3 × 10⁸ m/sλ (wavelength) = 760 nm = 760 × 10⁻⁹ mE = (6.626 × 10⁻³⁴ J·s * 3 × 10⁸ m/s) / (760 × 10⁻⁹ m)E = (1.9878 × 10⁻²⁵ J·m) / (760 × 10⁻⁹ m)E ≈ 2.6155 × 10⁻¹⁹ J.To convert this energy to electron volts (eV), divide by the elementary charge (e = 1.602 × 10⁻¹⁹ J/eV).E_

Q: What are the options for this CUET UG Physics question?

A. 2.43 eV · B. 3.18 eV · C. 1.64 eV · D. 2.68 eV

Question

Q17. The wave length of Red light in the visible region is about 760 nm the energy of photon in that case will be:
(a) 2.43 eV
(b) 3.18 eV
(c) 1.64 eV
(d) 2.68 eV

FirstInTest · Accepted Answer

The energy of a photon (E) is given by the formula E = hc/λ, where:h (Planck's constant) = 6.626 × 10⁻³⁴ J·sc (speed of light) = 3 × 10⁸ m/sλ (wavelength) = 760 nm = 760 × 10⁻⁹ mE = (6.626 × 10⁻³⁴ J·s * 3 × 10⁸ m/s) / (760 × 10⁻⁹ m)E = (1.9878 × 10⁻²⁵ J·m) / (760 × 10⁻⁹ m)E ≈ 2.6155 × 10⁻¹⁹ J.To convert this energy to electron volts (eV), divide by the elementary charge (e = 1.602 × 10⁻¹⁹ J/eV).E_eV = (2.6155 × 10⁻¹⁹ J) / (1.602 × 10⁻¹⁹ J/eV) ≈ 1.632 eV.Rounding to two decimal places, the energy is approximately 1.64 eV.

Answer

2.43 eV

Answer

3.18 eV

Answer

1.64 eV

Answer

2.68 eV

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