The value of Planck's constant is (a) 6.63 × 10 - 34 J/sec. (b) 6.63 × 10 - 34 kg-m2/sec (c) 6.63 × 10 - 34 kg-m2 (d) 6.63 × 10 - 34 J-sec.

Answer: (d). From E = hν: h = E/ν, unit Js⁻¹ = J s. h = 6.63 × 10⁻³⁴ J s; J/s (watt) and kg m ² are wrong units. So the answer is (d) 6.63 × 10⁻³⁴ J-sec.

The value of Planck's constant is | NEET 2002 (AIPMT)

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Photons: Energy, Momentum & Radiation Pressure

The value of Planck's constant is

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Answer: (d)

From $E = h\nu$ : $h = \frac{E}{\nu}$ , unit $\frac{\text{J}}{\text{s}^{-1}} = \text{J s}$ .
$h = 6.63 \times 10^{-34}\text{ J s}$ ; J/s (watt) and kg m $^2$ are wrong units.
So the answer is (d) $6.63 \times 10^{-34}$ J-sec.

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