Question

please solve it.............​

Answer 1

Answer:

8/7

Step-by-step explanation:

Taking theta as alpha

$cosec \alpha + cot \alpha = \frac{7}{8}$

We know that

${cosec}^{2} \alpha - { \cot }^{2} \alpha = 1 \\ (cosec \alpha + cot \alpha )(cosec \alpha - cot \alpha ) = 1$

Putting the value

$\frac{7}{8} \times (cosec \alpha - cot \alpha ) = 1 \\ (cosec \alpha - cot \alpha ) = 1 \times \frac{8}{7} \\ (cosec \alpha - cot \alpha ) = \frac{8}{7}$

Answer 2

Answer:

Answer:

Option A is correct

bcoz change in energy is given as

(b). we know that

f=c/wavelength

f=3×10^8/580×10^-9

f=5.172×10^14 Hz

wave number=1/wavelength

=1/580×10^-9

=1.72×10^6/m